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Day 35 of 60 · Week 5

Five weeks

Last reviewed · 3 min read · 15 sources · Plain-text version

Five weeks: how fast babies grow now, how much a bottle holds, why the evenings are all feeding, and a gentle leg-and-tummy game for between feeds.

A Middle Eastern father in a kitchen in overcast daylight holds his five-week-old semi-upright and tilts a bottle, pausing as the baby looks up at him, the mother eating at the table.

Five weeks today. Your baby is growing faster than they ever will again, and it shows in the feeding: more at each feed, and evenings that feel like one long one.

Heart

Babies typically gain 1.5 to 2 pounds a month now (AAP). That weight is built almost entirely out of the feeds you're doing around the clock. The scale at the 2-month visit will show it.

Head

Formula-fed babies usually take at least 3 to 4 ounces per feed, about every 3 to 4 hours, by the end of the first month; a rough daily guide is 2.5 ounces per pound of body weight, usually topping out around 32 ounces (AAP). Breastfed babies don't have a set amount: feed on cue, watching for early signs like lip smacking and rooting (AAP). On a bottle, watch your baby, not the bottle: stop when they turn away or seem full, even if it isn't empty, and never prop a bottle (CDC). If your baby gets any breast milk, keep giving 400 IU of vitamin D a day (AAP).

Body

Evenings: many breastfed babies bunch feeds together in the evening, sometimes every 30 minutes to an hour, and it doesn't mean your milk supply is low (USDA WIC). Growth spurts get the blame, but a 2024 review found little solid evidence that they happen on a fixed schedule (Davanzo & Baldassarre, 2024).

Diapers: after the first month, some breastfed babies go several days or even a week between bowel movements, and normal grunting and straining are fine (AAP). Gas, though, is real, and today's game is for it.

Try today

  1. The mother kneels at a floor blanket gently pedaling her baby's legs in a slow bicycle, the baby on their back looking up at her, the father watching from a chair.

    Bicycle legs and tummy rub

    Time: 1 to 3 minutes, between feeds · Bicycle legs and tummy rub in the guide

    1. Lay your baby on their back and gently move their legs in a slow pedaling motion.

    2. With warm hands, rub their tummy in slow circles.

    3. Talk as you go, and watch their face.

    Make it work:

    Stop if your baby fusses or turns away. Honest evidence: an AAP article suggests bicycling your baby's legs, a form of baby massage, to help move gas (Jana & Shu, AAP), but a Cochrane review of 34 studies found mostly poor-quality evidence and didn't support routine massage for healthy babies under 6 months (Bennett et al., 2013). Think of it as a way to connect that may help a gassy belly.

Watch for

  • Normal

    evening cluster feeding, with a baby who settles between feeds the rest of the day.

    Call your pediatrician within a day

    if your baby isn't gaining weight or always seems hungry (AAP).

  • Normal

    days between poops in a breastfed baby who is feeding well.

    Call within a day

    if stools are hard or your baby strains more than 10 minutes without success (AAP), and call right away for any blood in the poop (AAP).

  • Normal

    easy spit-up after a big feed.

    Call your pediatrician right away

    if your baby vomits 2 or more times, not just spit-up (AAP).

For you

The mother drinks a tall glass of water at the kitchen counter beside a plate of cut fruit, the baby asleep on their back in a bare bassinet in the next room.

Feeding a baby who's gaining 1.5 to 2 pounds a month takes food. Eat sitting down at least once a day, and keep a glass of water wherever you feed. For constipation, the Office on Women's Health suggests plenty of water and fresh fruits and vegetables (OWH). If you're feeding from the breast, a tender, red, warm area on one breast is a reason to call (MedlinePlus).

If you're the partner: dinner is the witching hour and the cluster-feeding hour at once. Cook, plate, and hand her a fork while she feeds.

Sources

This guide is general education that summarizes published research and guidance from groups like the American Academy of Pediatrics, the CDC, and the WHO. It isn’t medical advice, and every child develops on their own timeline. Your pediatrician knows your child; if something feels wrong, call them. In an emergency, call 911.

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