hii..for a 3 month old often should tummy time be given

Hi Sneha. No thumb rule as such. In between for few minutes to start off with. Baby should be comfortable. It can be 5-10 minutes.

thnks i wanted to know..hw many times during a day

As and when you feel and also when baby is in a playful mood. Which means that baby should be happy not hungry not sleepy and not too full.