Kitten ate moldy food

I feel like the worst mommy ever. My little guy, Alfred, is about three months old. Some wet food stuck to his bowl and got moldy, and I didn't see it. He ate food out of it and got sick last night and once more at 3 this morning. I didn't see the mold till today. He has eaten good food since then and was playing normally earlier. Now he has been sleeping since we got home from Grama's, and I have been trying to keep an eye on him. He had some tremors earlier, but none since then.

This is my first furry baby, and needless to say I am a paranoid mama. Any advice?

Don't beat yourself up, for starters.  We've all done things like this.  Secondly, keep an eye on him and get him to the vet immediately if you notice he's not eating, or if he has excessive diarrhea or vomiting.  Any change in play or litter box habits would also warrant a trip to the vet to be sure he's okay.  He's probably worn out from the trip.