Gray poop ni baby

Good day po. Nais ko lang humihingi ng inyong opinyon, my baby boy is exclusively formula fed. Coz his low birth weight his pedia recommend S26 Gold, for the 1st 2months and hslf okay naman siya, hanggang sa di na sya na poop everyday, longest is 3 to 4 days,minsan need pa suppository. Sabi ng pedia change kami into Enfamil Gentlease, so bumili muna ko ng maliit para ma-try lang, for a few days nag gray bigla poop niya. Eh, based sa research ko, di po siya normal. Meron po bang same case sainyo ng baby ko? Di pa po kase kami makapunta sa Pedia, wala pa pong schedula 'til now. Thanks po?! #1stimemom #pleasehelp #firstbaby #advicepls