Do yeast pancakes contain alcohol?

I fed my 2 year old pancakes that required yeast: yeast, mashed banana, warm water, whole wheat and buckwheat flour, and salt. I left the batch in the fridge overnight, and in the morning added a teaspoon of sugar, some more water, and a bit of oil. Fried them up on a shallow pan for just a few minutes and served.

My concern? How much alcohol/ethanol would yeast pancakes contain? Should I be worried about having fed these to a two year old???? I feel ridiculous in all sorts of ways…