I am a firm believer in this, my parents did the same to me every winter, I never had a cold until I discontinued the "winter dips". You won't hear a complaint from me about this as long as she doesn't hold the child under water too long. BTW, did I mention I'm American and grew up in Michigan?
No you didn't mention that. Nor did you mention that you're a friggin' idiot. There is absolutely no correlation between being subjected to this nonsense and the immune system. If you can show me that there is such a link, apply for your Nobel prize for medicine now. But as you can't, please stop making a complete fool of yourself by making ridiculous claims.
You're confusing google and being uneducated with being an educated medical professional.
Like all pseudoscience idiots (homeopaths, naturopaths, "done my research" parents) she bases her actions on nonsense. Cold water has absolutely no positive effect on the immune system.
She didn't get sick because she died of hypothermia! How stupid can you be?!