Colliders not inheriting the Transforms of changed animation states(Run to Crawl) -Unity3D

Am newbie in unity3D and i failed to make colliders inherit the Transforms of changed animation states!
Example i gave a sphere collider to a Tpose Character's head but when i switch to crawl animation the sphere collider just stays up ...doesnt inherit transform of changed animation .....How to fix this ...or which approach is better in using colliders with different animation like stand to slide/crawl/crouch
thanks
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