thanks Dr sonal & heena.

When your baby sleeps during the day keep the room noisy and bright. Awaken the baby frequently for feeds. Also when baby is awake be playful. Remember do not over tired the baby or keep the baby awake if baby is sleepy as this will make him tired and hence more wakeful at night. It will take a few days but slowly the pattern will change.

Try to make baby not to sleep in day time talk with baby play music and when baby sleeps continue try to make him/her awake. Then only baby will sleep at night