right amount of breastmilk

my LO is bottle fed but with my breastmilk (exclusively pumping) and im just wondering, my baby is 3 weeks old and she wants to drink 3 to 4 ounces of milk every 2 hours. pag pinapa dede namin ng 2 ounces, the next hour gusto na naman nya. i heard and ask my pedia and she said that a 2 ounce bottle is enough every 2 hours. She also refuses to sleep without a bottle on her mouth... (tried pacifier and it DID NOT work) is this normal? may mga mommy ba dito na same ang experience? thanks in advance.