Yesterday something irreversible in my opinion... We were walking with…

Yesterday something irreversible in my opinion... We were walking with my husband, the baby was sitting in the stroller, I decided to go to the store, turning around... and everything happens in a fraction of a second. I turned around and saw how the son flies down headfirst from the stroller (he held on to the edge, wanted to stand up sharply as if from an anchor and flipped his feet upside down)... My husband managed to react in time and caught him by the hand?I can't imagine what would have happened if he hadn't.