CANDIDA is NOT contagious. Don't you worry. Candida is a yeast that will be found in any healthy human beings. In their intestine, mouth and sinus.
We fight candida due to poor liver function that does not manage to stabilize ph properly. And as a result, this ph imbalance is favorable for candida reproduction.
Hence we are sick because we have TOO MUCH candida, but this is a side effect and our real aim is to rebalance ph.
Unless your wife had been utterly sick with candida while pregnant, I do not see how your kid could suffer from candida.
However, a side effect of candida is to stress out. Relax. spend time working on your communication skills with your wife. Just give yourself time to talk calmly with her on a regular basis and feed your kid well.