Baby girls appetite

J • Married since 2010
So my DD is only 3 weeks old and at her check up she weighs just fine and the doctor told us to let her guide us with feeding so in the daytime she has breast milk either I'll nurse her or a bottle and at night formula but she's been wanting to eat like 5oZ at night ....  It seems a bit much to me any experienced mommies out there that have gone through this ?!??