Hanna has been started on rice cereal. Only a tbs in her bottle... stage 1 nipple is too hard for her to suck the milk out. What do y'all suggest? I've tried making the holes bigger but can't seem to get it right and she will be started at a babysitter Monday. Do I go ahead and buy stage 2 or 3 nipples? Or is there another option? We use Dr. Browns bottles.