Question about formula fed babies

Hi all, 
My baby girl is 2 days old and was not latching at all and was miserable at night because she was starving. Nurse on call said to give her formula right away , she needs food. Anyway, I am noticing she is only drinking 1 oz every 3 hours. But I always hear it should be at least 2 oz? Ah I don't know... Nervous FTM! 
I am using avent bottles and enfamil formula if that matters at all.