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How Much Should Infants Gain Each Week? | Healthy Range

Newborn weight gain per week averages 140–210 grams in the first months, then slows after 4–6 months as activity rises.

At 2 weeks, most newborns take 1.5–3 oz (45–90 mL) per feed, 8–12 times daily—about 18–24 oz (540–720 mL) in 24 hours, with steady weight gain.

At 19 weeks, estimated fetal weight is ~240–280 g (8.5–10 oz), and healthy babies can sit above or below that band across percentiles.

At 26 weeks, a typical fetus weighs about 856 g (~1 lb 14 oz), with a healthy range of roughly 750–1,000 g based on fetal growth standards.

Babies gain about 150–200 g weekly in months 0–3, 90–140 g weekly by 6 months, then roughly 40–90 g weekly through 12 months.

In months 0–3, babies average ~28–30 g per day; by 4–6 months ~20 g daily, and after 6 months ~10–13 g daily based on growth standards.

Baby poop frequency ranges from several times a day to once every few days; soft stools and steady growth mean the pattern is likely normal.

For monthly baby weight gain, expect ~600–900 g in months 1–4, then ~400–600 g monthly through 6–12 months; preterm and illness can change the pace.

Most infants gain ~150–200 g per week in the first 3 months, ~90–140 g to 6 months, then ~60–110 g from 6–12 months, with day-to-day swings.

Most babies eat on demand; expect 8–12 feeds a day for newborns, then follow age-based portions and hunger cues as milk volume and solids progress.