It is normal for babies over two months old to sleep through the night, partly because they have enough milk during the day and sleep soundly at night, which is usually a sign of good development. Some of them may have abnormal conditions such as improper feeding or other infectious diseases. More than two months of the baby within 24 hours of sleep can reach 18 to 20 hours, most of the time in addition to milk is to sleep, an average of three hours or so to eat milk, in order to intake of adequate nutrition to ensure that the baby’s growth and development needs. As the baby develops and grows, the stomach capacity gradually increases, and the interval between breastfeeding is gradually extended. Some babies sleep soundly at night, and can sleep continuously for more than six hours at night, and it is normal for them to eat milk well after waking up, and they have enough milk for a day and good growth and development. Sleeping soundly also helps the development of the baby’s brain and height. A part of the baby sleep all night sleep, wake up performance appetite poor milk, consider is not normal, there may be improper feeding, easy to cause malnutrition, then you need to adjust in time, the night needs to be spaced out 3 ~ 4 hours to the baby feed once. More than two months the baby sleeps the whole night sleep, observe a day of insufficient milk or weight gain is not obvious, to timely strengthen the number of feedings, to avoid affecting the growth and development of the baby. Accompanied by other discomforts need to go to the hospital in time to check, clear causes under the guidance of the doctor to give conditioning and treatment.