...Our 5 weeks old boy takes > 4 oz every 3-4 hours... We don't know the exact number because the '>' part is from direct breast feeding so it can easily be extra 2-3 oz. Every kid is different. At her age, you may provide as much as she takes. Just make sure that she is crying for milk not other needs, such as a clean diaper, appropriate temperature or just a hug. Enjoy the baby :)