Formula help!

Ayah

Hey mamas! I’m a FTM and currently supplementing as well with formula. My baby (currently 7 weeks) has been pooping once a week and that’s with help from us. I’m not sure if it’s the formula or something more. I have him on enfamil gentlease, which I think is constipating him, then on enfamil reguline, which I honestly believe just makes him more gassy and fussy (and hasn’t regulated his BM either). What are you formula suggestions??