My six week old girl has been breastfeeding consistently for the past two weeks. She normally goes about 30 minutes on one breast before she unlatches and is "done". (She normally doesn't want any more milk after she finishes so I don't give her both breasts in one feeding session.) For the last two days though, she seems to only want to eat for about 20 minutes before she is "done". Is this normal? I am afraid that she might not be getting enough if she is cutting the time by 10 minutes per feeding session. I have tried to get her to eat a bit more after unlatching but she is usually not interested.