dont worry. my daughter drank 5 oz before, however, when she is around 2 1/2 month, she hate drinking milk. whenever i give her milk, she cries and cries. but she stops crying immediately when i take out the milk bottle from her month. now, she drinks 4 oz only. if you dont give her milk, she never ask for it. but my colleague told me her son also didn't like drinking milk when he was 4 month old. it's normal, so dont worry. if your BB refuse to drink, try to give him/her when she/he is sleeping.