Forty-five days of newborns a day without stool, may be a normal phenomenon. In itself, the number of daily bowel movements of newborns are not fixed, but in the newborn period will generally be the phenomenon of excessive bowel movements, and after forty-five days at this time the gastrointestinal tract function to enhance the digestive capacity has also been enhanced, so the number of bowel movements may be reduced, and occasionally a day without bowel movements is normal. Especially sometimes the outside temperature is higher, coupled with the newborn sleep more time, growth and development speed, there may be occasional one day without defecation phenomenon. If a forty-five day old newborn does not have a bowel movement for a day, if the spirit and appetite are normal, there is no need for special treatment, and you can continue to observe. If there are other abnormal symptoms, you should consult a doctor in time to avoid delay.