Question on feedings

my little girl just turned a month old yesterday and right now I pump and bottle feed with breastmilk mostly. sometimes she takes breast directly, but falls asleep about 5 minutes into it.

anyways...we upped her to 100ml today (she was taking 90ml every three hours) and extended her feeding time from every 3 hours to every 4 hours....do you think it's too soon to this? I'm a FTM and new to all this.

as she shows signs of being hungry after feeding we will up the amount. I do feel bad as I'm not able to pump enough for her to exclusively get breastmilk. I can only get max about 50ml each side so we have to supplement with formula.