Your 4-Month-Old Baby: Milestones & What to Expect

Development at Four Months

Your baby's coordination is taking off. Many four-month-olds roll from tummy to back, reach for and grasp toys, bring objects and hands to their mouth, and laugh out loud. Hand-eye coordination is sharpening, and floor play becomes genuinely fun.

Socially, your baby is increasingly engaged — recognising familiar faces, responding to your tone, and enjoying back-and-forth cooing 'conversations'. This is a wonderful age for play and connection.

• Rolling: Tummy-to-back rolling often comes first; supervise floor play and never leave your baby unattended on a raised surface.
• Reaching and grasping: Intentional reaching for toys shows growing control of hands and arms.
• Laughing: Those first belly laughs are a highlight — and a sign of blossoming social and emotional development.

Feeding & Nutrition

At four months your baby is a more efficient feeder, often taking feeds more quickly. Milk — breast or formula — still provides all the nutrition your baby needs; most guidance recommends starting solid foods at around six months, though some babies are ready slightly earlier. Your health professional can help you judge when is right for yours.

Feeds can be distractible now — your curious baby may pop on and off to look around. A calm, low-stimulation feeding spot can help.

• Ready for solids?: Signs of readiness include good head control, sitting with support, and losing the tongue-thrust reflex — but discuss timing with your health professional.
• Growth spurts: A brief increase in feeding frequency is normal and usually settles in a few days.

The 4-Month Sleep Change

Around three to four months, sleep matures into more adult-like cycles. This is a normal developmental shift, but it often shows up as more frequent night waking and shorter naps — commonly called the four-month sleep regression.

Total sleep is typically around 12–15 hours, with wake windows stretching to about 1.5–2 hours. This is a good time to gently establish a simple, consistent bedtime routine so your baby learns to associate certain cues with sleep.

• Cycles mature: Sleep now moves through lighter and deeper phases, so waking between cycles is normal.
• Bedtime routine: A predictable wind-down — bath, feed, quiet song, sleep — helps signal that night is coming.

Crying & Soothing

With longer wake windows and a busier brain, overtiredness is a common cause of fussiness now. Watching sleep cues — yawning, looking away, rubbing eyes — and offering a nap before the overtired stage makes settling much easier.

Many of your earlier soothers still work, and your baby may now also enjoy a soft toy to look at, gentle bouncing, or being carried in a sling for closeness and motion.

• Catch the sleep window: Settling an alert baby before overtiredness hits is far easier than soothing an exhausted one.
• Floor play for calm: A little tummy time and floor exploration helps burn energy and supports better sleep.

Conclusion

Four months is full of firsts — first rolls, first laughs, first real routines. Enjoy the playfulness, ride out the sleep changes with consistency and patience, and keep leaning on what works for your family. Every day your baby is learning more about you, and you about them.