The child hugged the woman about 11 a.m. Tuesday, causing her to stumble through the window.
Kalamazoo Public Safety Lt. David Boysen said the woman and child "were on the stairs" when "the kid ran up and jumped to give her a hug." Both fell 15 feet to the ground, but were conscious and alert when police arrived.
They were treated at an area hospital. Their relationship was not immediately known.