One month in, and more personality is showing. The first social smile can appear any time between four and eight weeks, and it changes everything. Here is the lay of the land.
Typical day · week 4
- Feeds: 8 to 12 milk feeds in 24 hours
- Sleep: 15 to 17 hours across day and night
- Naps: Wake windows of about 60 to 90 minutes
- Diapers: 6 or more wet; dirty varies by feeding type
Feeding
Feeds often get quicker and more efficient as your baby gets stronger, whether from breast or bottle, and the loose rhythm you have been sensing becomes a little easier to read. A formula-fed baby this age often takes around 3 to 4 oz (90 to 120 ml) per feed. Keep following hunger and fullness cues rather than finishing a set amount.
Sleep
Most babies this age sleep in cycles of about forty-five minutes and wake easily between them. Two to four wakings overnight is expected, and sleeping through the night is not developmentally realistic for months yet.
Diapers
Breastfed babies sometimes change their stool frequency around now, from several a day to fewer, larger ones; formula-fed babies tend to stay more regular. As long as your baby is comfortable, both are normal.
Growth
A typical gain is roughly 5 to 7 oz (150 to 200 g) a week, and your baby may look visibly fuller in the face and limbs. Plot the line on the growth curve rather than fixating on one number.
This week's leap
That first social smile may appear, and your baby turns toward sounds and follows slow-moving objects. Talk and sing constantly; language development starts long before words. If colic appears, it often peaks around now and resolves by about three months.
Slow weight gain at this stage is usually a solvable feeding issue worth raising. Forceful, projectile vomiting after feeds (different from small posset spit-ups) should be checked. Rapid breathing, ribs drawing in, or blue or pale skin needs urgent help, as does any fever of 100.4°F (38°C) under three months. None of this is medical advice; every baby is different, and your midwife, health visitor or doctor is the person to ask about your own child.
The calm way to follow all of this is to log it in one tap as it happens, then read the pattern over a few days rather than carrying it in your head. Little Bean shows this same week-by-week guidance inside the app, beside your own baby's log.
Quick answers: 4 weeks
How often should a 4-week-old eat?
Most babies this age take 8 to 12 milk feeds in 24 hours. Feed on demand rather than by the clock; steady weight gain and enough wet diapers are the real signs intake is fine.
How much sleep does a 4-week-old need?
Roughly 15 to 17 hours across day and night. Wake windows of about 60 to 90 minutes. The range is wide, so treat these as averages rather than targets.
How many wet diapers should a 4-week-old have?
6 or more wet; dirty varies by feeding type. A sudden drop in wet diapers is worth a same-day call to your pediatrician.
Milestone reference: CDC developmental milestones, 2 months checklist.
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