This is a little bit of a trick question!
We are more concerned with YOU and if you've been cleared by your doctor to resume regular activities (including exercise). If you've delivered vaginally, this is typically at 6 weeks, or 8 weeks if you had a c-section.
Once cleared, you can begin classes whenever you're ready! As long as your child still enjoys a ride in the stroller, they are welcome to keep coming to class.