There are many reasons why a 1-year-old baby cries in the middle of the night, which may be related to a variety of reasons such as hunger, ambient temperature discomfort, colds, aches and pains, and other physical discomforts. 1. Hunger. Since 1-year-old babies cannot accurately express their needs through language, when they are hungry, they can only show it by crying. 2. Ambient temperature discomfort. As babies are less able to adapt to the indoor environment, it is easy to cause crying. 3. Physical discomfort. When the baby due to cold, body pain, flatulence and other kinds of cause discomfort symptoms, also prone to crying. When your baby cries in the middle of the night, you should first consider the common causes, and if you can’t identify the cause, you should consult a doctor in time to clarify the cause under the guidance of the doctor in order to actively treat it.