While many parents wish this was true, it’s not. In fact, it’s fairly uncommon for a baby to sleep through the night at 3 months. Sleeping through the night is part of a baby’s development. For the first three months, babies sleep between 16 to 20 hours a day, spread out within 24 hours. At around 4-6 months, they start to get a sense of day and night, and might sleep a bit more at night. By the time they’re 9 months old, 75% of babies will actually sleep through the night. Don’t worry too much if your child doesn’t. It will come with time. Resource: (Friedman J., & Saunders N. Canada’s Baby Care Book: A Complete Guide from Birth to 12 Months Old. (The Hospital for Sick Children). 2007. Toronto, ON: Robert Rose Inc.)