A 9-month-old baby should drink 200-250ml of milk at a time, and can add supplemental food in moderation between feedings. Generally speaking, 9-month-old babies drink about 200 to 250ml of milk each time, need to feed 3 to 4 times a day, but each child’s growth and development is different, the amount of milk will be different, as long as the child grows healthily, weight and so on in the normal range of values, parents do not need to worry too much. When the baby is 9 months old, only milk can not meet the needs of growth and development, need to add appropriate amount of complementary food, supplement the growth and development of essential nutrients, you can eat some boiled rice and noodles, puree, steamed eggs, porridge and other complementary food, general feeding time for complementary food between two feeds, and breastfeeding alternately. It is recommended to go to the hospital regularly to assess your baby’s physical development and add complementary foods under the doctor’s guidance to avoid malnutrition.