"it looks like a little worm".
I had to laugh a bit. I wasn't offended.
I've never been with an intact man, so I've never seen an adult. And even DP (who's circ'ed) has said similar comments about DSS (intact) who's now 4 and rather large... if you're not used to an intact penis, and our culture is So used to a perfect little mushroom head staring at you, yeah, it takes a moment to get to used to it.
But a worm? Ah, I had to laugh a bit.
Still... it's those comments, even starting at 13months, that will aide to esteem issues. It's not a "worm". It's the way it SHOULD be.
I do wish, sometimes, that DP was intact, just for DS (and DSS's sake)...to have something to compare to. It will just make for questioning that much sooner. Luckily DP was the deciding factor for both boys on remaining intact, so he is mourning the loss of his foreskin... and can share that with both boys. Show his scar, really discuss what circumcision Means... and why it's a benefit to them being intact.