planned formula milk.

hello! Just wanna ask if any mama's started formula as soon as baby is born? I am a 2nd time mama and planning not to breastfeed my 2nd baby as I really want to spend more time with my first and 2nd born and want to be more attentive to the both of them.... if so, do you feel guilty or what kind of emotions you feel? I mean I am not selfish to not breastfeed correct? :((