Research indicates that setting a bedtime routine early in a child's life can help them get the sleep they need. As early as 3 months old, it can be helpful to start putting an infant in bed drowsy so that they can get used to falling asleep while on their own in bed.  For other parts of a bedtime routine, parents can gradually establish a series of activities based on their child's age and development. Activities that promote healthy sleep can often be maintained or adjusted as a child gets older.