This happens because of the wake and sleep cycle of baby is different from ours. When he was in womb he sleeps during our day as mothers are active and they are rocking to the movements.
During night time mother sleeping no movement and children play whole night, the same pattern continue once delivered for 2 months.
Next Steps
Feed them for 15-20 minutes and they get 2 hrs solid sleep.
Health Tips
Avoid mobile and tv in bedroom use mosquito net.