It would be helpful to know how many hours you work on your side hustle to average $500/month and how many hours of babysitting you're thinking about paying for.
I think it is a great idea to consider outsourcing tasks so you can focus on revenue-generating work, but it all depends on the numbers. I have someone mow my lawn and our rental home's lawn - for $70 bucks I get back 4 hours of my life and don't have to mess with lawn equipment, etc. Totally worth it to me for someone juggling a family w/kids, full-time job, + side hustle. I would see this (or getting your oil changed or hiring a cleaning service, etc.) as the same principle.
Edited: What LibertyStache said.