Baby sleep less may be related to environmental factors, improper diet, lack of vitamin D, parasitic infections and other factors. 1. Environmental factors: if the baby’s sleep environment is not quiet enough, wrapped too thick, noisy sound, bright light stimulation, etc., may lead to poor sleep environment, affecting the baby’s sleep quality, the baby sleep less. 2. Improper diet: If the baby is overfed or underfed, it may lead to abdominal discomfort and hunger, affecting the quality of sleep and the baby’s lack of sleep. 3. Lack of vitamin D: If you don’t give your baby vitamin D supplement in time, it may cause calcium deficiency in the body and increase nerve excitability, which will lead to baby’s difficulty in falling asleep and waking up frequently, resulting in the phenomenon of baby’s lack of sleep. 4. parasitic infection: if the baby occurred parasitic infection, such as pinworms, more in the night climb out of the anus in the perianal activities, resulting in the baby anus itching, discomfort, affecting the baby’s quality of sleep, the phenomenon of baby sleep less. The baby appeared to sleep less to rule out environmental factors, parents should immediately take the baby to the hospital, clear cause of the disease under the guidance of the doctor active treatment.