It is usually normal for two-month-old babies to sleep through the night. The younger the age of the baby in months, the longer the daily sleep required, two-month-old babies usually sleep up to about 16 to 18 hours a day. Babies may be due to the daytime light stimulation, noisy sound and other factors, so the waking time will be gradually extended, the night lights dim, eat enough, quiet environment, etc., which leads to two-month-old babies sleep through the night. Two months baby sleep whole night sleep can let the body get enough rest, for the baby’s growth and brain development have certain benefits, as long as the baby did not appear to cry or other physical discomfort, it is a normal phenomenon. Two months baby sleep whole night sleep if the baby appeared discomfort phenomenon or slow growth and development, please take the baby to the hospital in time, a clear diagnosis, at the same time parents should be concerned about the baby’s physical and mental changes.