How do I sleep train my baby and let my baby sleep longer at night ?

Get baby to wake up at around the same time every morning and put baby down for naps at the same times each day. Set a clear boundary between day and night so baby will associate the night with sleep. If baby's daytime routines are active, keep his bedtime routine as calm and quiet as possible. My friend would actually nurse her baby when the child is on the verge of sleeping instead of before. This helps her baby sleep longer at night.