my 9 week old is sleeping during the day, but suddenly is all active and refresh at night between 12 am -4 am which results is me being unable to sleep or get rest at that time. when she sleeps during the day, she will only wake up at 2 hr interval for her feeds and then sleep by herself again. how do I make sure she sleeps properly during night so I can also get some sleep.

Question

Accepted Answer

Sleeping pattern in children may be variable in different age group so if the baby is active and taking proper feeding with no other complaints most of the time there is nothing to worry. 
You have to just see the child should not be uncomfortable which may be because of factors like temperature of the room nasal blockage some discomfort like infantile colic or hunger.
In older children a proper discipline is required so that the sleeping pattern can be schedruled accogrding to a proper time try to avoid too much of screen time with sometimes can be the causative factor for disturbed sleep.