On average, your baby should take in about 2 1⁄2 ounces (75 ml) of formula a day for
every pound (453 grams) of body weight
. But he probably will regulate his intake from day to day to meet his own specific needs. So instead of going by fixed amounts, let him tell you when he’s had enough. If he becomes fidgety or easily distracted during a feeding, he’s probably finished. If he drains the bottle and still continues smacking his lips, he might still be hungry.