Unlike adults, babies cannot express their will through verbal communication, so when some physiological needs are not met or when they feel unwell, they will express themselves through crying. Parents should pay attention to this and focus on the following aspects. First of all, children should consider whether they are hungry after crying, children will cry because of hunger, generally newborns and toddlers about every 3-4 hours, the food in the stomach, the basic digestion is completed, this time will appear because of hunger crying. Breastfed babies can eat as much as they want, as much as they want. A formula-fed baby needs to control the amount of formula intake according to time and age. Secondly, when the baby feels unwell there will also be crying, such as when the temperature in the house is higher or lower, then the baby will cry. If the baby has peed, the baby will also cry if the diaper or diaper is not changed in time. Finally, if after excluding the above behaviors, the baby is still crying, you should consider whether there is a disease that causes discomfort and crying. For example, abdominal distension, indigestion, food accumulation and fever, etc., need to focus on the investigation.