After the child birth my wife has lost her libeddo ans she don't like sex at all an has been year since we had great sex what should we do?

The key to any good relationship is to try to understand each other. Talk to your wife and ask her why she doesn't want to have sex. She may be experiencing pain, fear of another pregnancy, exhaustion, changing hormones, etc. Don't insist on Sex or force yourself on her as this could cause a permanent fracture of the relationship. Try to work with her in a kind, compassionate way.