Babies who keep crying may be due to physiological factors, such as hunger, sleepiness, inappropriate temperature, and may be related to pathological factors, such as calcium deficiency. 1. Physiological factors (1) Hunger: it is one of the most common reasons for babies to cry, because babies grow and develop fast and need a lot of nutrition and energy, so they are often easily hungry. (2) Sleepy: there are also some infants are sleepy, hoping that parents can put them to sleep and the crying. (3) Unsuitable temperature: this situation can also cause crying, parents can use their hands to touch the baby’s neck and observe the baby’s body temperature. 2. Pathological factors: when the infant is sick (such as intussusception, etc.), the body will have obvious symptoms of discomfort, which will also cause crying, parents need to pay attention to the infant’s temperature changes and other abnormalities. If the infant keeps on crying, accompanied by excessive sweating, pillow baldness and other phenomena, it may be a symptom caused by calcium deficiency. There may also be other reasons why the baby keeps crying, so it is recommended to go to the hospital in time for a relevant examination to clarify the cause of the disease and then actively treat it.