If you're bottle feeding your baby, you can use stored breast milk, formula, or a combination of the two. As a general rule, babies need approximately 2.5 ounces of formula per day for every pound they weigh.
When your baby is a newborn, their stomach is very small. They need frequent feedings with small amounts of milk. A newborn can drink 1–2 oz of milk every 2 to 3 hours. As your baby grows, they'll need more milk but will eat less frequently.
Once your baby starts eating solid foods, they'll need about 600 ml of milk or formula per day. When your baby is between 6 and 12 months old, they'll need milk or solid foods 5 or 6 times a day. Your baby should drink formula or breast milk until they're at least 1 year old. After their first birthday, they can start drinking cow's milk.
Hungry babies often start rooting. This is when they open their mouths and search for your breast or bottle nipple. They might also bring their hands to their mouth and suck on them or other objects. Learning to spot these hunger signs can make it easier to keep your baby happy and well fed.