Breastfeeding for two and a half month old babies can be about 600~800ml of milk a day, 150~180ml each time, 5~6 times a day. Two and a half months of infants if you choose to breastfeed, can each feed about 150 ~ 180ml, about 3 ~ 4 hours once, 5 ~ 6 times a day, about 600 ~ 800ml a day. Breastfeeding is not necessary to deliberately calculate the amount of milk, you can indirectly observe the baby’s weight growth, urine output, eating and sleeping status to determine whether the milk is sufficient. If the baby is artificially fed, the amount of milk can be calculated according to the baby’s weight, generally 135ml/(kg-d), 2.5 month old babies are breastfed 6 times a day, and the amount of milk needed for each feeding can be calculated according to the baby’s weight. Parents are advised to feed their babies scientifically and rationally according to the actual situation of their babies and lactation, or consult a specialist for professional advice.