In short, a baby relies on milk from mother or formula for the entire first year of his or her life.
A baby gets almost all of its nutrients from the milk alone. Though most introduce solid foods at 6 months, food before one is just for fun.
A baby is not very successful or interested in eating enough of a variety to get the nutrients they need.
Because of the importance of these nutrients for a baby's growing body and brain, I have provided a helpful chart below to guide you and how much milk consumption baby needs throughout the first year.
Overall, how much milk a baby drinks, depends on growth and age, but having a guideline is helpful.
Every baby is different and remember, because formula takes longer to digest and has less fat, a baby usually drinks more volume than breastmilk. It's not uncommon for a 9month old baby to drink 4 oz of breastmilk at a feeding and that same baby to drink 7oz of formula.
As always, consult with a lactation consultant or doctor if you have any concerns!