M.D.
I would say I absolutely would. BUT, my daughter was just shy of 4 and we went to a friends pool party at their house. My daughter jumped in and couldn't swim!! I was headed inside to change into my suit, and she was supposed to be waiting with my sister and my 8 week old. I just stood there screaming "someone save my baby!!!" Another mom jumped in fully clothed and got her out.
Hindsight is 20-20 and we all say we would, but when something happens, I think it's more typical to freeze from fear.