Is my guinea pig sick or picky?

i dont think there is anythink to b that worried about. i think because u have brang a new food product into the cage. there most likley to feed on that because its new. maybe the younger one dosnt like anyother one? she may only like carrots... if u have brought different brands of the vegies then that might be a factar? i think wait for a couple of more days. and if it dosnt improve then take the younger one to the vet