Final answer:
The common amount of weight gain from birth to 4 months of age is approximately 28 grams (1 ounce) per day during the first two months, and then slows down to about 0.45 kilograms (1 pound) per month during the remainder of the first year. By 4 months of age, an infant would generally have doubled their birth weight.
Step-by-step explanation:
The common amount of weight gain from birth to 4 months of age is approximately 28 grams (1 ounce) per day during the first two months. After that, it slows down to about 0.45 kilograms (1 pound) per month during the remainder of the first year. By 4 months of age, an infant would generally have doubled their birth weight.