Baby Zantac

My sons pediatrician put him on Zantac after seeing him arch his back at one of the appointments. I thought he might have reflux but didn’t spit up much. We tried it for 2 weeks. I basically just felt like he spit up way more, but didn’t know if that was normal. I told her at his 2 month visit and she said we can stop it...Now he is spitting up way more than before and is very fussy all day. Which I’m sure is partially from his shots. Anyone have any experiences with Zantac for your baby?!