J.K.
I used to be the mom that said they are her ears to pierce and she need to be old enough to choose... HOWEVER... my daughter finally got up the guts to get her ears pierced at 9 years old and it did not go well. She fiddled with them until she almost worked them out of her ears and we ended up taking them out. I don't know if they will heal completely and she'll be able to get them re-pierced or not.
She has asked me... "why didn't you get my ears pierced when I was a baby???" And I stood by my answer of... "they aren't my ears to pierce." But I kinda wish I had done it then. Apparently babies don't even notice them and it's not a big deal. But I don't know about 13 months... that might be a whole other thing.
So, sorry I don't have advice about it. I just wanted to say that I see both sides of the argument... and I don't think you're a bad Mom.
I also want to add that I find it frustrating that this site is becoming more and more about people criticizing others for their choices and less about giving advice and support. The question wasn't about whether you should do it or not. In fact you clearly asked for people not to read you the riot act for the choice you're making. If people don't have anything constructive to add or if they can't do it in a kind, helpful way, I wish they'd just skip it instead of making every post their soap box. Ok, I'm off mine now...