Baby talk

Anyone else's august kiddo doing a lot of whining and baby talk lately? My daughter is fully capable of talking like a normal child, but often does the baby talk thing. I can't figure out if it's because she's imitating her little brother, especially because he's now starting to get more into talking and getting less whiny.

I guess I'm just hoping it's because there's a younger kid in the house and not just a typical threenager thing.. I really hope my son doesn't have the same problem in two years!!