Maybe you could bring up the fact you've been seeing some difficulties during mealtime and remind them you want best for their child. You could also just implement the changes
CPR and First Aid are helpful in case an emergency happens but most of the time common sense, intuition and safety will do the trick
That is way more than justified. One can not live on minimum wage and the work you are doing is that of 5 different teachers, parent, nanny, dog sitter and so much more. You deserve pay which reflects that.
Babies that small aren't too interactive. You can get a giggle from them by lifting them into the air or tickling them most times but for the most part you should entertain yourself while keeping the baby safe.
Not paying overtime definitely isn't legal. You work, you have to get paid. I think you should talk to your employers about setting reasonable boundaries and giving you a more accurate time frame of when they are coming home.
I would say around 20 dollars an hour
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