The baby always wakes up and cries to consider three reasons: First, the most common reason is that the baby sleeps too much, uncomfortable, so crying, parents are advised not to give the baby too many clothes to sleep, the quilt does not cover too thick, while we should pay attention to the indoor environment temperature is not too high, pay attention to keep the room quiet, so that the baby sleep comfortable. Second, the more common baby tummy discomfort, pay attention to observe whether the baby has vomiting, diarrhea symptoms, whether there is milk flap or mucus inside the stool, if there is that the baby may be cold, tummy discomfort, so restless sleep at night, you can give the baby to eat probiotics, while more massage tummy, to promote intestinal peristalsis, to prevent discomfort caused by intestinal flatulence, affecting the baby sleep. Third, the more common is the relative lack of vitamin D, now the baby mother will be timely to supplement the baby vitamin D, but because infancy is the fastest growing baby period, some babies grow and develop faster, the regular supplementation of preventive amount of vitamin D is not enough to meet the growth and development needs, it is recommended to add a doubling of vitamin D, a month of continuous supplementation, and then changed to the amount of prevention is good.