After getting burnt couple of times with the little one activating some random timers or replying to emails from notifications, I am now systematically turning on the water lock when holding him and it works well.
There is a regular lock function but after a few tentatives, wrong pins increase the time before you can unlock again which isn’t ideal.
So well done Apple for a true water and baby proof lock 
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I do this too! Water lock plus theater mode in church is my standard baby-holding setup. (There’s no nursery.)
With our first due in September, this is useful information to know!
My infant son always turns this on. Now maybe I have a reason… 