for special formula it is best to consult PD. My baby spit up all the time. after a while we realised she will ache her back and scream while feeding her, so we brought her to PD. there, Dr suggest giving A.R formula due to reflux. best to consult PD.
https://sg.theasianparent.com/transitioning-to-formula-how-to-choose-the-right-formula-milk-after-breastfeeding