Formula switch

Nicole • 20.Taken.Mom December 23rd 💕🎀👣👶🏽

My daughter is currently on the yellow can of enfamil (infant) but she’s been super fussy and will not poop as much as we try to get her to and help..Ima ask her doctor if i can switch her to the purple can which is supposedly for her fussiness crying and gas..But how do i go bout actually switching the formulas for her ?