回答
-
Did you warm up in the bath?
-
Didn't you warm up in the bath?
「お風呂でちゃんとあったまった?」は、
Did you warm up in the bath?
Didn't you warm up in the bath?
などが言いやすいと思います。
「手が冷たいじゃない!お風呂でちゃんとあったまった?」は、
Your hands are still cold! Did you warm up in the bath?
Your hands are freezing! Didn't you warm up in the bath?
などで、どうでしょうか?^^