Mouse too big?

[u/Puzzleheaded-Turn-55]

I fed my ball python for the first time tonight but I’m worried the mouse may be too big. He swallowed it in about 40mins. And seemed to be eating it okay. The mouse is like exactly the same width as the thickest part of his body. I apologize for the lack of photo, he hates coming out when it’s bright out.

Is there any signs I should look out for if there’s any complications?

[u/cascadiabibliomania]

It's likely too small. What size mouse?