Why is my baby fussy?

Haley

My baby is a month old today, she was taking 3 oz of formula and since last night that hasn’t been enough to satisfy her so we’ve been giving her 4. She ate 4 oz and 2 hours later ate 3 oz and now, and hour later she seems to be hungry again... I don’t want to over feed her and give her a tummy ache or make her throw up. Is she fussy because she’s hungry or is this a growth spurt they go through around 1 month making them fussy and super hungry?