What is a normal developmental milestone for newborns related to weight?

Newborns typically gain rapid weight within the first two weeks of life, but they do not typically lose weight or gain significant amounts of weight in such a short time frame. It is also not normal for a newborn to gain 10lbs in the first week as their birth weight is typically between 5-10lbs. Additionally, triple weight gain by 6 months is not a normal developmental milestone for newborns, as it varies for each individual baby. The most typical and expected developmental milestone related to weight for newborns is a rapid weight gain within the first two weeks of life.