A one-year-old baby crying at night may be caused by physiological factors, may also be caused by pathological factors, such as vitamin D and calcium deficiency, indigestion, intussusception and so on. 1. Physiological factors: a one-week-old baby crying at night may be caused by a scare before bed or sleep when the hunger, you can hold the baby up to soothe, can help the baby fall asleep again, if it is caused by hunger and need to breastfeed in time, usually in the milk can be restored to normal, usually do not have to do special treatment. 2. Pathologic factors: (1) vitamin D and calcium deficiency: if the one-week-old baby vitamin D and calcium deficiency, will also make the baby cry in the middle of the night, but also difficult to fall asleep, night sweats (after falling asleep sweating abnormally, waking up sweating stops), slow growth and so on. (2) Indigestion: If the baby eats too much before bedtime, it may put a burden on the intestines and stomach, causing symptoms of indigestion, bloating, abdominal pain, etc., which will make the baby cry and toss and turn. (3) Intussusception: Intussusception is when a section of the intestinal tube is lodged into the lumen of the adjacent intestinal tube, causing the baby to experience abdominal pain as well as abdominal lumps. One-week-old baby crying at night may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.