The old man said that children’s leftovers can not be eaten by others belong to the feudal superstition. But children’s leftovers are not recommended to eat again, easy to breed bacteria, resulting in malnutrition. General leftovers in the number of bacteria will increase, produce toxins eaten in easy to cause acute gastroenteritis, vomiting, diarrhea, severe dehydration, electrolyte imbalance and other manifestations. Prolonged consumption of leftovers, there will be carcinogenic substances such as nitrosamines, causing nausea and vomiting, bloating and diarrhea and other symptoms of malnutrition. In addition, in recent years, the rate of gastric Helicobacter pylori infection is high, it is recommended that parents should reduce the number of meals out to avoid the transmission of Helicobacter to children, do not eat children’s leftovers. Parents should give their children more fresh vegetables and fruits in their daily life, rationalize their dietary structure, and increase physical exercise appropriately. It is recommended that babies should consult the doctor in time if any discomfort occurs, and be treated actively under the guidance of professional doctors.