Most babies learn to sleep all night during the first year. And many babies go back to sleep easily after their nighttime feedings. Some babies take longer to learn to sleep through the night. Even at two years old, one child out of every five wakes up and cries most nights. The baby's personality may be a factor.
Some babies are restless, and they wake easily.
Others sleep soundly and for a long time. Others need less sleep, and they wake up very early in the morning. Waking at night is not considered a problem for families in every part of the world. In some cultures parents don't expect babies to go to sleep alone, or at a certain time or place. But for many parents in our society, it is hard when babies wake up at night.