wrap (one) up in cotton wool
To be overprotective of one; to coddle one. You need to let the little lad play in the dirt once in a while. If you keep wrapping him up in cotton wool, he'll grow up too soft.
wrap someone in cotton wool
be over-protective towards someone.wrap somebody up in cotton ˈwool
(informal) protect somebody too much from dangers or risks: If you keep your children wrapped up in cotton wool, they’ll never learn to be independent.