The reasons for a two-year-old baby’s night crying can be attributed to both physiological and pathological factors, including feeling cold, feeling hot, hunger, or having bad dreams. Additionally, certain diseases like rickets and worm infections may also affect the baby’s night sleep. It is recommended to undergo checks to determine the specific cause and actively prevent and treat related diseases. Hunger is the most common cause of crying, especially as infants get smaller, they become more prone to hunger.