S.D.
I too have a 3 month old.She is very well interested in her surroundings.She has always had a habit of falling asleep during tummy time and I even mentioned it to her dr.but she wasn't concerned.My daughter is rolling over back and forth and doing many things right now it very well could be that she is learning new things by leaps and bounds at this time and is working on rolling over at this time.But if you have any concerns on your childs development then discuss them with your dr she should be having her 4 month checkup coming soon.Also keep track of what she has been able to do and new things because the dr will ask..But more that likely your daughter is. fine