Stages of Infant Development: A Month-by-Month Baby Milestone Guide

In short: A baby goes through stages one after another: smiling and laughing in the second month; holding the head steady, reaching for objects and doubling the birth weight in the fourth; sitting with help and rolling in the fifth; sitting briefly alone, trying to crawl and cutting the first teeth in the sixth; sitting freely and picking up small objects in the eighth; and first steps and understanding simple words between the tenth and twelfth months. The timing varies a little from child to child.

Childhood holds some of the most remarkable growth of a person’s entire life. In the first few years, your baby develops in almost every way imaginable — physically, emotionally, and socially. Your little one begins responding to the world around them and slowly learns to adapt to it, organizing new skills and abilities as they grow into a complete, unique little person. Parents cannot decide their baby’s exact height, weight, or talents — and that’s okay, because these differences are what make every child special. If your child seems to be developing a little differently than expected, don’t panic — many differences are normal — but mention it to your doctor, who can check whether any support is needed. Responding with comfort, patience, and plenty of love helps your baby thrive emotionally and reach their fullest potential.

• Video Infant Development

1. Early Infancy

In the earliest days, your baby sleeps for most of the day, waking mainly to feed. Most of their movements are simple reflexes. Your baby shows typical newborn characteristics, like sucking their lips when hungry or clenching your finger when you place it in their palm. It’s not yet common for a newborn to express clear feelings, but you may catch an occasional, reflexive smile.

2. One to Two Months Old

Your baby grows quickly during this stage. When lying on their stomach (the “prone” position), they can lift their head to about a 45° angle and turn it side to side. Lying on their back, they begin to focus their eyes on objects and stare at them — a great time to introduce a rattle or soft toy as a gentle stimulant. Many babies clench their fists tightly while sleeping, and some will suck their thumb or fingers instinctively. Your baby may suck their thumb often, and cry when hungry. If you notice them staring toward one side consistently, this is usually related to how they’re positioned — try repositioning them occasionally to support healthy head shape.

• The Infant From two to nine months of age:

3. Two Months Old

Around this time, your baby starts to smile — a moment that brings real joy to parents and deepens the parent-child bond. Your baby becomes emotionally more settled and begins responding warmly to those around them. They’ll also stay awake for longer stretches during the day and start settling into nighttime sleep.

4. Three Months After Birth

Your baby begins showing early social behavior, expressing themselves through kicking, wiggling, smiling, or blowing bubbles in response to your actions. Their unique personality starts to emerge. Primitive reflexes fade as voluntary movement increases. The neck reflex is gradually replaced by coordinated eye-and-hand movement — your baby will try to touch everything they see. This is a key transitional stage. Moving, noisy toys are great choices now. Your baby can hold their head steady for short periods and may nurse while looking around at the same time. Blowing bubbles is a joyful milestone and an early building block for language. Sometimes babies also “play” with their own voice as a way to explore feelings and practice speaking.

At this stage, your baby thrives on consistent, loving care. If daily routines feel unpredictable or inconsistent — whether from parents or the surrounding environment — your baby may find it harder to settle into their own rhythms. This doesn’t mean you need rigid rules, but try to keep a steady routine for feeding, playtime, and sleep. If your baby cries out of boredom, try softly telling a story, lying beside them, or gently resting a hand on their back. It’s also fine to take a short break for yourself if your baby is safely playing alone nearby.

5. Four Months Old

By now, your baby is settling into their own patterns for eating, sleeping, and activity. They sleep more at night and stay awake more during the day. They can reach out for objects they want and hold their head steady, even supporting the upper body with both hands while on their stomach.

Neck and back muscles grow stronger, allowing your baby to sit briefly with support. If you support their back and hands while helping them rise, they’ll stretch their legs as if trying to stand. By this stage, their weight typically doubles from birth. Lying on their back is often their favorite position for play. They enjoy exploring their own body — playing with their hands and putting them in their mouth. When they spot their food, they’ll try to bring it to their mouth themselves. At this age, your baby explores the world through touch and taste, learning to tell things apart.

Vision is still developing, but your baby can already recognize their parents and connect with them emotionally. If they’re sensitive to sound, they may show interest in rustling paper or a ticking clock. They can briefly hold onto short memories. Reading aloud to your baby now can support their development while helping them get to know your voice even better.

• Video of lactation

6. Five Months Old

Rapid weight gain slows a little, but social and behavioral growth is remarkable. Your baby may sit with support from a chair, flip between back and stomach easily, and lift the upper body, hands, and legs higher than before. Hand-eye coordination becomes noticeably sharper, and they can reach out purposefully for objects.

Hearing continues to develop, and your baby can turn their head toward sounds. They begin showing clearer preferences — becoming excited at the sight of their bottle when hungry, or upset if a toy is taken away.

Your baby seeks your attention through crying, babbling, or calling out. If you’re busy with guests and seem to ignore them, they may cry more insistently. Listening to soft music together is a lovely way to nurture your baby’s emotional development.

Around now, the mouth becomes an exploration tool — your baby will try to put almost anything within reach into their mouth. Keep small or dangerous objects well out of reach, and always keep an eye on them, even during solo play.

Choose comfortable clothing that allows free movement, along with a diaper to manage the occasional accident.

This is also a good time to begin encouraging early language skills. Try making it playful — give your baby the chance to babble and repeat sounds, which helps build their hearing and speech development. Their growing senses of hearing, vision, and touch lay the groundwork for symbolic thinking later on. They’ll try and “fail” often, and that’s completely normal — avoid pushing or scolding, and instead offer encouragement regardless of the outcome. This builds confidence and reassures them of your love. If they seem to prefer playing solo, that’s fine too — just stay nearby and watchful.

7. Six Months Old

Life gets busy at this age. Your baby may start crawling and sit alone for short periods. Curiosity blooms as they take a growing interest in everything happening around them, shaking objects and examining small parts of their own body like fingers, toes, ears, or nose. Many babies start teething around now.

If held under the arms, they may attempt to stand with slightly bent knees, though true standing is still a little ways off.

Development typically moves from head to feet, which is why leg control still takes time. Your baby continues practicing by bending and extending their knees and kicking. Crawling itself is a major milestone — it requires much more than muscle movement; it takes coordination and balance between many muscle groups working together.

Your baby can now hold moving objects and recognize familiar voices, especially yours. The emotional bond with parents deepens. If they cry seeing you hold another child, it’s not necessarily jealousy — it’s a natural expression of attachment and a wish not to feel left out. They still can’t judge what’s safe on their own, so continued supervision remains essential. A fun way to support development: hold your baby in front of a large mirror and let them study their own reflection. Point to your reflection and say “Mama,” then point to theirs and say their name. With repetition, they’ll begin learning to tell themselves apart from others.

Bath time is another wonderful chance for play — floating toys make bathing fun. Never leave your baby unattended in water, even at very shallow depths.

8. Seven Months Old

This is a great time to babyproof your home — cover sharp corners, secure electrical outlets, and keep gas sources and small or harmful objects out of reach. At this age, babies love to grab, hold, examine, and then toss things aside. Choose soft, comfortable clothing that allows free movement. Your baby may begin recognizing faces more clearly and grow wary of strangers, sometimes crying or calling out with early sounds like “mama” or “dada” if you approach someone unfamiliar. They can also start to sense praise, rejection, or a gentle scolding from your tone. Many babies have their first teeth by now, though timing varies widely — some appear earlier, some later, even into the first year, and this is entirely normal. If your baby seems fussy and chews on things more, it may be a teething sign; gently massaging the gums can offer comfort. Babies often kick off their blankets, so instead of loose covers use a baby sleeping bag (wearable blanket) suited to the room temperature, and always put your baby to sleep on their back with nothing else in the cot.

9. Eight Months Old

Your baby becomes more physically active — bouncing, reaching, and grasping firmly at anything within reach. They move more freely now, may enjoy hiding behind curtains, or crawl beneath furniture out of curiosity. They can hold toys with both hands, sit alone for short periods, and stand briefly with your support. Fine motor skills improve, allowing them to pick up small items with their fingers. Memory is still developing but slowly improving — they notice changes and respond more socially. Some babies become a bit more strong-willed at this stage, which can be challenging. Try to respect their preferences while gently and calmly setting limits when needed.

Many babies begin babbling sounds like “mama” and “dada” around now. Some delay is normal, but if your baby isn’t making any vocal sounds at all, it’s worth checking in with your pediatrician.

10. Nine Months Old

Your baby becomes an active little explorer — reaching into gaps between doors and walls, opening drawers, tumbling occasionally, tearing paper, and tossing things onto the floor. They enjoy following you around, imitating your actions, asking (in their own way) for things, and may resist being held if they’re busy exploring.

Stay alert for safety, while still allowing space for healthy exploration. They may try putting a cup or glass to their mouth on their own.

By this age, most babies have 4–6 teeth.

When bored with a toy, they may toss it and watch it fall — a fascinating discovery for them. They’ll briefly track moving objects, then reach to grab and inspect them closely. Toys that encourage finger movement or active body motion tend to become fast favorites.

Speech is developing more slowly than physical and behavioral skills, since the brain regions for language are still maturing — but babies are absorbing language quickly behind the scenes. Talk to your baby often, and pronounce words clearly to support their speech development.

11. Ten to Twelve Months Old

You may be amazed watching your baby take their very first steps as they approach their first birthday, even if those steps are wobbly. It can feel like time has flown by. While you’re busy with everyday tasks — washing dishes, tidying up, preparing bottles — your baby is fascinated by everything you and your partner do, from reading the newspaper to helping around the house. They love imitating you, picking up on your habits and manners along the way.

While your baby may still be shy with strangers, they often enjoy watching themselves in the mirror and may spend time observing their own reflection or toddling around the house. They can express simple “yes” or “no” responses, and often understand more words than they can say. Ask, “Where’s Dad?” and they may look right at him. They enjoy praise and may show displeasure at words like “no” or “don’t.” Many babies at this age remain cautious with unfamiliar faces.

They begin to understand concepts like inside versus outside, choose their favorite toys, and may throw toys to express feeling bored or lonely — a sign of growing emotional awareness. Hand-eye coordination becomes quite refined, closer to adult-like precision. They may pick up small objects using thumb and forefinger, and rotate their fingers to grasp very small items like a thread. They start wanting to do things independently, such as attempting to drink on their own, even if it gets a little messy.

You don’t need to buy every toy on the shelf — everyday sounds like a ticking clock or ringing phone can delight your baby just as much. Every child has their own interests, and many enjoy safe household items like plastic cups, wooden spoons or empty boxes. Keep watches, keys, remote controls and anything containing a button battery, as well as makeup and medicines, out of reach: a swallowed button battery is an emergency. Encourage their curiosity and support their growing independence

Every baby develops at their own pace, but talk to your doctor if your baby does not smile at you by 2 months, does not hold their head steady by 4 months, does not sit without support by 9 months, does not babble (‘mama’, ‘baba’) by 9-10 months, does not pull to stand or wave by 12 months, is not walking by 18 months, or at any age loses skills they already had..

Physical Exercises for Your Infant

At every stage, gentle exercises can support healthy growth and prepare your baby for the next developmental milestone. Many babies especially enjoy these moments of play with their father — most little ones love movement and gentle activity:

1 - Exercise helps your baby engage confidently with their surrounding environment.

2 - It supports both physical and mental development.

3 - It encourages balanced, reasonable behavior.

4 - It builds self-reliance and confidence.

5 - It may support overall immune health.

6 - It helps your baby become more socially engaged.

1. Getting Started with Gentle Activities

In the earliest weeks, parents play the leading role — your baby relies entirely on you. It helps to approach this time with warmth: “I am so glad to take care of my baby.” Below are some gentle exercises that support healthy growth, keeping in mind that every baby responds a little differently.

At first, your baby spends most of their time lying down. Over time, they’ll progress to sitting, standing, climbing, and eventually walking. Before starting any exercise, keep these tips in mind:

1 - Your baby will respond best when they’re feeling happy and relaxed.

2 - Aim for 5–10 minutes per session, a few times a day.

3 - The best time is before meals or before a clothing change.

4 - For very young babies, exercise on a soft, towel-covered surface; as they grow, a table or the floor works well.

5 - Keep the room at a comfortable temperature (around 22°C / 72°F), and remove clothing and diaper for the session.

6 - Start gently, repeating each movement about 4 times, and increase gradually day by day. After around two weeks, you can introduce new movements. If your baby especially enjoys a certain motion, feel free to repeat it more often.

7 – Never force exercise if your baby seems fussy or upset. Smile, talk gently, and stay attentive to their mood and comfort throughout.

2. Exercises from 2–6 Months of Age

1 - With your baby on their back, place your thumb in their palm and gently stretch their arm out with your fingers. Repeat with the other arm. Slowly raise one arm above the head, then lower it and switch sides.

2 - Turn your baby onto their stomach and gently raise their arms to stretch the abdominal muscles. Lifting the upper body a little helps strengthen the back and supports head control.

3 - While your baby lies on their back, gently hold one shoulder and press down lightly; hold the other arm and bend the elbow a few times, then rotate it gently in a circular motion, watching closely for comfort.

4 - With your baby on their back, gently cross their arms like an “X” while supporting the front of the shoulders. Repeat in a smooth, rhythmic way.

5 - Turn your baby onto their stomach, gently stretch the fingers, and support the chest and abdomen as you lift slightly. For older babies, you can support the shoulders and move them gently, like a little bird.

6 - With your baby on their stomach, gently hold the feet and knees and roll them from side to side. To turn them onto their back, gently lift the legs.

7 - Support the chest and abdomen while your baby lies on their stomach — gently assist rather than lifting the body yourself.

3. Exercises from 7 to 12 Months

1 - With your baby on their back, kneel and gently hold their lower legs, slowly bending and straightening the knees and hips in a cycling motion, keeping your baby’s back and bottom on the floor, before turning them onto their stomach. Never lift your baby by the ankles.

2 - Kneeling, gently guide your baby into a squatting position. Support them at the upper thighs and slowly help raise the whole body, keeping hands and feet on the ground for support.

4. Exercises After 12 Months

1 - Kneeling, help your baby stand on your lap facing you. Support their shoulders and gently help them “climb” toward your shoulders, leaning back slightly to make it easier.

2 - With your baby on their back, kneel in front of them, holding their hands directly or using a small stick — let your baby grasp one end while you hold the other, then raise it gently upward so they naturally pull up to stand. This helps strengthen arm and shoulder muscles.

3 - With your baby on their stomach, support the abdomen, gently stretch their fingers, lift slightly, and sway them side to side — much like a gentle little swing.

Dr Najeeb Layyous F.R.C.O.G

Consultant Obstetrician, Gynecologist and Infertility Specialist

For personalized guidance on your baby’s growth and development, or any questions during pregnancy and beyond, the team at Dr. Najeeb Layyous’s clinic is here to support you every step of the way.