4 Week Old Baby: More Alert, One Month In and What to Expect

Your Baby at 4 Weeks Old

A 4 week old baby — about one month old — is more alert and feeding on cue, around 8 to 12 times in 24 hours in these early weeks, according to the Canadian Paediatric Society. A 4 week old may sleep up to 18 hours a day, for 3 to 4 hours at a time, waking to feed. By the end of 3 months, most infants can raise the head and chest during tummy time, watch faces closely and follow moving objects.

Your 4 week old baby is emerging from the deep sleepiness of the very first weeks — and so are you. Alert windows are getting longer, eye contact more frequent, and there's a flicker of recognition when your baby hears your voice.

This guide covers your one month old: what's developing this week, how feeding works as you settle into a rhythm, how much sleep is normal, and how to look after yourself.

Your Life This Week: The Parent Experience

One month in, you can often read your baby's cues a little better — but that doesn't mean it suddenly feels easy. Sleep deprivation is still significant, and swinging between tenderness and being overwhelmed is normal. You are doing a hard thing well.

A loose daily rhythm — feed, awake time, sleep, repeat — brings a little predictability without the pressure of a strict schedule. Your baby's sleep won't become predictable until sometime after 3 months, the Canadian Paediatric Society notes, so this is gentle structure, not rigid timing.

The "baby blues" affect up to 80% of new mothers and usually ease within a few weeks, according to the Canadian Paediatric Society. But if you're experiencing persistent sadness, anxiety, or a sense of disconnection from your baby, please talk to your doctor or public health nurse. Postpartum depression affects about 13% of new mothers, and as many as 10% of fathers — it is common, treatable, and nothing to be ashamed of.

Feeding Your 4 Week Old Baby

A 4 week old baby feeds on cue. The Canadian Paediatric Society advises feeding on demand and notes that in the first few weeks, breastfed babies feed 8 to 12 times over a 24-hour period. As your baby grows, feeds gradually become a little bigger and less frequent. For formula, follow the feeding chart on your formula's packaging and let your baby's cues guide the amount.

You'll know your one month old is getting enough by the CPS signs: six or more wet diapers a day, soft yellow stools, a content baby, and steady weight gain. Cluster feeding — short, frequent feeds bunched together, often in the evening — is still normal and, the CPS notes, may mean a growth spurt; it comes and goes over the early weeks.

Whether you breastfeed, formula feed or combine the two, a one month old needs a steady supply of iron, vitamin D and brain-building fats like DHA. If breastfeeding isn't an option, the Canadian Paediatric Society advises a store-bought, iron-fortified, cow-milk-based infant formula for the first 12 months — fortified to provide these nutrients.

A note on formula this week. As you settle into a rhythm, it's a good moment to build a calm, consistent, safe bottle-feeding routine. MOF's organic Stage 1 formulas, such as HiPP Dutch Stage 1, are iron-fortified and suitable from birth through 6 months, providing the vitamin D, iron and DHA your baby needs to grow. Formula is a good choice whenever it's the right one for your family.

Sleep at 4 Weeks: What's Normal & How to Help

A 4 week old baby may sleep as much as 18 hours a day, for 3 to 4 hours at a time, according to the Canadian Paediatric Society, spread across day and night with no predictable night stretch yet. Waking to feed overnight is normal and healthy.

This is developmentally normal. The Canadian Paediatric Society notes that sleep habits become more predictable sometime after 3 months, so settled nights aren't here yet. What you can do now is make day and night feel different.

Keep daytime bright and full of normal household sound, and keep night feeds calm, dim and quiet, avoiding stimulation, as the Canadian Paediatric Society suggests. Putting your baby down drowsy but awake, when you can, gently supports settling over time.

Safe sleep reminder: always place your baby on their back for every sleep, on a firm flat mattress with a tightly fitted sheet and no loose, soft items, in a crib, cradle or bassinet in your room for the first 6 months. The Canadian Paediatric Society advises this lowers the risk of SIDS.