Is it normal for a newborn baby to lose 150 grams 1 day after being born?

Babies are born with some extra fluid, so it is perfectly normal for a newborn to drop a few ounces when that fluid is lost in the first few days of life. A healthynewborn is expected to lose 7% to 10% of the birth weight, but should regain thatweight within the first 2 weeks or so after birth.