Budgie is getting thin
I got two budgies about two and a half months ago. This is the first time I've owned birds. Both are pretty active. The girl (at least I think she's a female) is very talkative and active. She hops and climbs all over the cage and plays and swings on her toys.
Just in the last week or so I noticed that she's starting to look a bit thin. She doesn't seem sick though. She's just as active as always and I do see her eat, drink, use the cuttlebone, and go after the millet seed I put in. I'm worried about her but I'm not sure what to do. Is this normal, or should I see if I can find a vet?