Ok so I found this place called my gym and I was wondering if any of you have been there? There are more locations than just Chino Hills, but that's the closest to me.
They have classes for infants 6 weeks - 6 months, 7-13 months, 14-22 months etc.
I think I might take DD once she is sitting up unassisted for a longer time.
They also have the Mommy & Me free play classes and I think the age groups are different for that one.