See how your newborn's current weight compares to their birth weight — as a percentage, and as an average gram-per-day change.
Losing up to about 7% of birth weight in the first few days is common and generally considered normal, especially in breastfed babies while milk supply is establishing. Loss beyond about 7–10% is when pediatricians typically start looking more closely at feeding.
Most newborns regain their birth weight by about 10–14 days old. Regaining it a few days later than that isn't automatically a problem, but it's a common check-in point pediatricians use at the two-week visit.
Once past the initial weight-loss period, a commonly cited range is about 20–30 grams (roughly 0.7–1 ounce) per day for the first three months, though this varies with feeding method, birth weight and individual growth pattern.
Weight loss beyond about 10% of birth weight is generally considered a signal to have your baby evaluated promptly — it can point to feeding difficulties (latch, milk transfer, supply) or other issues that are usually very manageable once identified. Contact your pediatrician rather than waiting for the next scheduled visit.
No — this tool compares your baby's current weight only to their own birth weight, to see the direction and rate of change. Our Growth Percentile Calculator instead compares a measurement to the wider population of babies the same age, which is a different (and complementary) way of looking at growth.