Madalein is 3 months old, I'm not sure of her exact weight but it's between 13 and 15lbs (12.5 at her 2 month appt.). She isn't a chunky baby, but she isn't skinny either. We're feeding on demand about every 2 hours and she'll take anywhere from 3-5oz at a time. I read that it should be 2.5 for every pound, well she's already at 30oz today and it's only 4pm. She's going to drink atleast 9 more ounces before midnight.