Formula for supplementation suggestions

Andrea • FTM to a beautiful baby girl 💖 Veterinary Technician 👩‍⚕️🐈🐕

Hello moms! I have a 1.5 month old beautiful baby girl who has been primarily breastfed but occasionally supplemented with a bottle of Earths Best Infant formula once-twice a day. I had to do this because after leaving the hospital we struggled to gain weight. She’s now maintaining ideal weight for her size/age! Originally the pediatrician had her on Enfamil NeuroPro and now I recently transitioned her to Earths best but now she is getting gassy. I gradually transitioned her and had no problems then but now that she is on the earths best she is getting fussy and farts more than ever! Any other formula suggestions that could be used to supplement and maybe digest better?