Baby swim school?

Ok so my son is 3 months old. The other day I was taking him a bath and the sling I lay him on popped off and if it wasn’t for me being there he could of drowned so I started looking for baby swim schools and I found one 5 minutes away from my house on saturdays from 12:30-1:00 the classes are free just had to pay 50 dollars registration for the whole year. I thought this is great because accidents happen what if I had stepped away for that one second or something so I told my husband I want to enroll my son into this baby swim school and he said I was “stupid” and “rushing” things and that he is too small to learn to swim but I think it’s better to know that my son will be safe around water if anything was to occur and so I enrolled him and now my husband is annoyed with me. Am I being reasonable?

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