The feeding of a newborn baby is a critical area where his weight gain is achieved mainly by feeding him breast milk or cow’s milk. The feeding method is mainly through sucking and the main amount is fed on demand. Feeding on demand means that he will eat when he is hungry and when he is full he will automatically stop sucking and then start resting and sleeping. If the amount of milk is not enough, the child will show signs of continuing to cry after eating and it is impossible to reach a quiet sleep state. If there is a lot of milk, the child will automatically give up the sucking action and then fall asleep quietly. The most adequate amount of milk for newborns is judged to be about 150 ml per kilogram per day.