I found some ways to say that a baby had a defecation, but I'm not sure which of them common and which of them will cause immediate laughing or to raise eyebrows.
As I understand, while seeing a physician he may ask it in a formal way: Did the baby had a defecation?
While mother or father may say to each other about their baby: "I think she pooped". I also found "I think Dillon did a doodie", "See if she made a stinky".
I am looking for the common but polite ways (=not rude) to ask a little child or about him if he had a defecation.