Sure sound travels though water and solids very well.
BUT
When sound travels from one medium to another much of it is reflected.
I doubt that much of the sound even reaches the baby.
Go to a pool , take two shot glasses with you, go underwater , tap them under water with you , now get someone to tap them above the water while you are under water.Tell me what you find.
OR stick your head up a cows arse get your buddy to fire a 30-30 beside the cow.Tell me what happens there.

You will look petty silly stuck behind a cow with your head up it's arse doing 27.8 Mph.