Pay in home sitter?

Looking to get an in home sitter for my 2.5 yo (half way potty trained) and my 5 mo. 6-7 hours a day. $15-$16 an hour. My question is, Do I pay for each child the sitter will be watching? (Double the pay?) I’m so clueless. I’ve only grown up with older siblings watching kids in the family for little to nothing lol. Please advise me.

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