7 week old is not eating as long as before.

K

For about the last week my baby girl has drastically shortened her nursing time by at least half. When she was younger she nursed at least 10 min on each breast, but now she might nurse 5 minutes on one breast and won't take anymore. She is gaining weight very well. Anyone else notice this with your baby around 7 weeks? I'm hoping she's just nursing more efficiently and gets full sooner.