Usually the baby's intestines are cooked in three months. Three months ago, the baby had to hold the baby vertically. After more than five months, the baby can sit on his lap. Relatively speaking, when the baby has bowel movements, the frequency of defecation will decrease, so parents don't have to worry too much. Pay attention to let the baby drink more water. Indoor temperature should not be too high, keep indoor humidity. You can put a humidifier in the house. If it is autumn and winter, you must have a holiday. There is no need to put it in summer and spring.