Hi momma.
Sorry to hear you are having a difficult time, worrying about weight gain is very stressful.
I don't have much experience with Infantrini, but you may want to check this link that has some mommy who has some experience in this. Hope it helps https://babyandbump.momtastic.com/threads/anyone-changed-to-infatrini-after-poor-weight-gain.295188/