8mo old constipated, won’t take bottle

Kara

My LO is breastfed, doesn’t take a bottle. Since we introduced solids last month he has been constipated for the past few days, only pushing out a piece or two the size of a small grape and they’re firm pieces. I called his pedi and they said to feed him apples and bananas, apple juice, prune juice and if this doesn’t work, a small amount of Miralax. Obviously I can’t try the juices or Miralax. I’ve tried about 5 different brands of bottles to see if there was a nipple he’d take. Also dad is the one giving him the bottles. Idk what to do if he won’t take a bottle without having to go to the pedi.