when should infants double birth weight?
<answer> About 4-6 months of age <context> Newborns continue to gain about five to seven ounces a week for the first 3 to 4 months of life. Most babies should have doubled their birth weight by 6 months, but many may have doubled their birth weight by 4 months of age. By 1 year old, most babies have tripled their birth weight.