One year old babies have difficulty falling asleep may be the result of physiological factors such as environmental temperature discomfort, eating too much food before bedtime, or consider the intestinal cramps, rickets and other diseases. 1. Physiological factors: if the indoor environment is too hot, too cold, or the baby ate too much food before bedtime, may lead to the baby’s physical discomfort, a year-old baby sleep difficulties. 2. Intestinal cramps: the cause of intestinal cramps is not yet clear, may be due to allergies, localized cold, overeating and other factors. The child will have abdominal pain, due to abdominal pain can appear one year old baby sleep difficulties. 3. Rickets: Rickets is due to vitamin D deficiency in the body. Affected children manifested as night crying, excessive sweating, irritability, etc., can appear one year old baby sleep difficulties. One year old babies have difficulty sleeping, there may be 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.