Gumby the ways people protect this part of them as as varied as people are. I don't think anyone really understands the mental gymnastics that a child goes through to do this.
And the outward behaviors are just as varied
Some children withdraw. I became an invisible child - except when another person needed help (as you see some of that is still in operation)
Some act out socially getting into trouble with the law in an attemmtp to call attention to their problems indirectly and some to the point where they are acting out their abuse on other children.
Some become perfectionists/overachievers trying to control everything because they can't control the one thing they really need to control. Others learn to fail at everything in a vain attempt to prove they deserved the abuse
Some hurt themselves either through self-injury or through risk taking behaviors (much of the addictive behaviors come from this)
Some learn to use their sexuality to try to get their needs met and others become asexual
Some become care-givers (wide range here) in an attempt to protect others in a way they were never protected
Some children may revert to younger behaviors (sucking thumb, bed-wetting, clinging)
Oh and Some join cults