adjusting sim location in blender animation

I tried copying  the keyframes for an animation from an adult rig to a child rig in blender, but after transferring them, i noticed that the child body is halfway through the floor throughout the whole animation.

Can anyone explain to me how i adjust the location of the child in the animation for all frames all at once when i am in frame 0 without having to do all frames one by one?

Thank you!