Before doing hardening, you need to take note of the basic rules:

You can not force a child to do what he wants with you. Benefits such hardening will not bring. Try to start the procedure in a game form.

Observance of constancy. The first time it will be hard to teach the child to repeat the procedure of hardening every day. But, having endured a maximum of a month, it will become a habit.
In order not to harm the body, the duration of the procedures should be increased gradually.
Quenching the child's body in no case can not begin if he is sick.
clothing
Pay a lot of attention to how much clothes the child has. We must not forget that children are very mobile, so it is unlikely to freeze without an extra sweatshirt. It is better to take it for a walk in case of a cold snap. The child should be dressed as an adult, but it should have clothes made up of natural fabrics, one layer more.