Ay normal lang yan, mama! A lot of our babies do that kahit napa-burp na, it's usually just milk overflow or they ate too much, especially around that age when they're still figuring out feeding. The key thing is kung gaano kadami ang suka and kung okay ang baby otherwise, if baby's gaining weight, hindi laging crying, at hindi projectile vomiting, you're probably fine, but better check with your pedia just to be sure kasi first time mom ka pa lang at it's always good to have peace of mind!