C.G.
Babies most often have a growth spurt around 6 weeks of age. You little one is probably nursing frequently to satisfy her hunger and to keep your milk supply up with her demand. Babies are gifted with something I don't have-- they do not eat if they are not really hungry! So rest assured she will not get too full. There are some variations that can cause tummy troubles, overactive let-down and oversupply. They usually cause green colored poops. Most likely your baby is just being a normal baby and making her mom worry!