Nowadays, most of the babies are fed artificially, and the sources of animal milk are not as restricted as breast milk, so many mothers are ready to meet as long as their babies want to eat, regardless of the day and night, resulting in a general delay in night weaning time, which may cause a series of problems: 1, easy to cause indigestion, anorexia. The intestines do not get enough rest at night, “children’s spleen is often deficient”, the overload is prone to indigestion, anorexia. 2, easy to cause infant sleep disorders. Expressed as frequent night waking, sleep difficulties. If you take scientific method to feed, start regular feeding after 1 month of birth, and stop night feeding after 4 months, you can establish regular sleep for infants as soon as possible, so as to reduce the incidence of infant sleep disorder. 3.Easy to cause infant tooth decay. Generally after breastfeeding at night, parents do not have time to clean the baby’s mouth, resulting in oral milk stain residue, affecting oral hygiene, and some children appear dental caries. 4, urine loss: Some children who still keep the habit of drinking milk at night will cause more urine at night, which will easily lead to urine loss. 5. Obesity: If children have sufficient nutrition during the day, night milk will become extra calories and excess energy will easily lead to overweight or obesity. How old can babies be weaned from night milk? Babies should start to develop good eating and sleeping habits as soon as they are born, and arrange breastfeeding and sleep reasonably on the basis of breastfeeding on demand. From midnight to early morning, i.e. from 23:00 to 5:00 the next day, people need sleep to relieve fatigue and recover their energy. Breastfeeding during this period will interfere with sleep and the circadian rhythm of life of mother and child, which is not conducive to the growth of infants. Most infants between 2 and 3 months of age do not need to breastfeed at night, and at 4 months of age, the continuous sleep time can be extended to 6 to 8 hours. Therefore, it is recommended that infants over 4 months of age should not be scheduled to nurse from midnight to early morning. If they do need to nurse, they should be adjusted to a time closer to the ideal time between midnight and early morning. Many mothers worry whether their babies will be hungry if they stop nursing at night. In fact, if babies aged 4-6 months have developed the habit of nursing regularly, nursing once every 3-4 hours, 5-6 times/day, with a total daily milk intake of about 800ml, the amount of milk they eat during the day is sufficient to maintain their growth and development, so there is no need to worry that babies will be hungry. On the contrary, after the baby stops nursing at night, he or she will sleep solidly and for a long time, which will promote growth and development. Some mothers are worried about their babies being hungry and even wake them up to eat when they are asleep, which is very undesirable.