Babies are full and still keep looking for food, usually because of inadequate feeding, love of milk, foraging reflexes and other factors are related. 1. Inadequate feeding: normal babies know that hunger and fullness is usually on-demand breastfeeding, part of the baby’s breast milk is insufficient to meet the baby’s nutritional needs, although the milk time is longer, but the amount of lactation is relatively small baby can not be full, so the baby will be frequent to look for milk to eat. 2. love milk: most often seen in frequent milk sleep baby, will lead to excessive dependence on the baby, can not sleep peacefully on their own, before going to bed will always look for milk to eat, only sucking on the nipple in order to sleep peacefully. 3. Sucking reflex: As the foraging reflex has not completely disappeared in younger babies, if parents touch the skin around the baby’s mouth, the baby’s foraging reflex will be triggered. The baby will swing his head from side to side and make the movement of opening his mouth. Smaller babies can be fed on demand, but if older babies have frequent breastfeeding, slow growth or other discomforts, they should go to the hospital for further tests to determine the cause.