Breastfeeding

My baby lost 12% of her weight during the first 4 days after birth. When we brought her home she had big appetite and on revenge mode to get her weight back. Few times she finished 100ml breastmilk in one feeding session (no cholic) and some other time she got hangry in 1 hr and we gave her another 40ml of milk (this was her feeding portion). Going to 2nd week, she’s still occasionally gets hungry in 1 hr when taking breastmilk. However, formula never fails to keep her full for 3 hrs. Breastmilk lasts only 1-2.5 hrs.