My youngest girl is about 10 weeks and getting lazier. She runs if I walk towards her so I know her legs work, but seriously she seems to be getting lazier She likes to lay down and eat at the feeder but while I was watching her this after noon,she was laying in the garden and eating, and would scoot along without standing up to get more pellets. The other 3 girls ranging from 12 weeks to 12 months all stand and eat. Should I be concerned?