Formula and breast milk

Jasmine • 18 years old, mommy to a lil boy named Chase 💞👶
Is its gonna be bad for my baby to eat formula and breastmilk? I'll be feeding him breastmilk a majority of the time but sometimes I can't give him the milk he wants on demand, especially since he has troubles latching on so my nipples crack & bleed. 
But will a bottle here and there of formula gonna mess up breastfeeding him?