Premature baby weight also affects how healthy your little one will be. The end of the third trimester is when babies gain weight quickly to get ready for birth. Some babies gain weight faster than others but an early delivery often means a small baby.

How much weight do preemies gain per day?

It might be as little as 5 grams a day for a tiny baby at 24 weeks, or 20 to 30 grams a day for a larger baby at 33 or more weeks. In general, a baby should gain about a quarter of an ounce (30 grams) each day for every pound (1/2 kilogram) they weigh. (This is equal to 15 grams per kilogram per day.

How much weight should a preemie gain in the first month?

A healthy newborn is expected to lose 7% to 10% of the birth weight, but should regain that weight within the first 2 weeks or so after birth. During their first month, most newborns gain weight at a rate of about 1 ounce (30 grams) per day.