Crying is how babies communicate. According to a 2017 study, newborns cry for about two hours a day in the first few weeks of life. This increases to between two and three hours a day by six weeks. By the time your baby is four months old, his or her crying may last just over an hour a day. By then, you’ll have more experience reading your baby’s cues and cries. In addition, some of the tips below may be helpful in calming your baby down.