Some babies like both tastes some babies just prefer one

I was doing that like the first week he was born I was giving him enfamil infant the yellow can and breastmilk at first it was fine afterwards he got too gassy and fussy everytime I tried giving him the formula he wouldn't take it he would spit it out all the times he got used to the breastmilk & it's better for them even now he's almost 4 months I try giving him formula when I'm not producing enough and he don't take it at all. Good luck