Quoting Kenzye and Chris' Mommy ::" We haven't had the diaper off so I don't know if it's been erect the whole time. My husband just changed ... [snip!] ... heard anything from the nurse yet, but if it was gone a moment ago, Im assuming it's only happening when the diaper comes off/?"
My sons penis always get's hard for a little bit when his pull up comes off in the morning. I am guessing it's from the shock of cold air, but since I don't have one, I can only speculate
It goes away after awhile tho.