Unfortunately, children often suffer from colds. Make it as rare as possible, hardened your child. the easiest way is down.
Sew thick Terry towels mitten on the hand of the kid, and he let himself every morning, wipes his hands and chest this mitten moistened with water. And you help him to wipe his back (he didn't get) and then RUB with a dry towel so that the skin is reddened ("burned"). Over time the child learns to RUB himself.
At the beginning of the tempering procedure mitten should be moistened in warm water and each time make it a little bit cooler.