Smaller babies, especially those born in winter, as well as multiple births, premature births, and those who grow too fast, should consider whether they have vitamin D deficiency, which can be improved by moderate supplementation of vitamin D preparations. 1, before bedtime should not eat too much, sleep should not be over-feeding; usually 9 months after the baby, can sleep all night, no need to feed at night; 2, before bedtime should not be too excited, such as should not watch TV, should not be too teasing, should not go out, etc.; should not intimidate, scold the child. 3, life is regular, there is enough activity and outdoor activities during the day, sleep on time every day; 4, dressed and covered with appropriate, environmental temperature, humidity, especially for sensitive skin, there is really baby, should not be too hot and dry; 5, baby sleep process, there will be rolled over, mouth muttering, occasionally cry a few, mostly belong to the normal performance of light sleep, the mother can pat the baby a few times to show comfort, no You don’t need to turn on the lights, and you don’t need to pick him up to coax him.