my daughter only drank 45-60ml when she was 1 month. However, she only finishes 150-180ml each ml though she is 6.5 months. She is now 18.5lbs. Don't push BB too much or they hate drinking.
My baby used to drink 160 ml since 2+mth until 4+mth cos she don't like to drink milk. Now she's 6+mth and drinks 180ml. Sometime she can drink in 10 mins but need 30 mins in average to finish all.