Babies wake up easily during the day, may be related to environmental factors, vitamin D deficiency and gastrointestinal dysfunction. 1. Environmental factors: If the baby sleeps in an environment that is too noisy and at an inappropriate temperature, it is easy for the baby’s sleep to be disturbed, thus waking up easily during the day. 2. Lack of vitamin D: baby daytime sleep easy to wake up may be lack of vitamin D caused by the baby lack of vitamin D will lead to increased neural excitability, thus sleep easy to wake up, accompanied by occipital baldness, excessive sweating and other symptoms. 3. Gastrointestinal disorders: babies sleep easily awake during the day may be caused by gastrointestinal disorders, if not fed properly, so that the baby indigestion, and then sleep easily awake, and can be accompanied by bloating, constipation, spitting up frequently and other uncomfortable symptoms. The baby easily woke up during the day, there may also be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.