Usually, a one-and-a-half-year-old child crying in the middle of the night may be caused by eating too much, holding urine, physical discomfort and other reasons. 1. Eating too much: Because the digestive function of a one-and-a-half-year-old child is usually weak, if the child eats too much at night before going to bed, resulting in indigestion or flatulence, it will cause the child to cry. It is recommended not to give children too much food at night. 2. Holding back urine: Holding back urine is usually one of the main reasons why one and a half year olds cry at night. When urine fills the bladder and is not removed in time, it may irritate the child and cause crying. It is recommended that you do not give your child too much water an hour before bedtime. 3. Physical discomfort: when the child in the middle of the night, eczema, gastroenteritis and other diseases, will trigger physical discomfort, more through the way of crying to express discomfort. A one-and-a-half-year-old child crying in the middle of the night may also be caused by other reasons, if the child crying and more crying more powerful, parents are advised to take the child to the doctor in time to check, clear cause of the disease in the doctor’s guidance for treatment.