I don't need that where I am. We've got plenty of free and paid baby and toddler classes as well as kid friendly cafes and restaurants. There's a local lady that's converted her double garage into a small events space and she runs a singing group with a twist in there for say 8-12 kids plus their grown ups at a time, several times a day. So at £6 a person she's on to a good thing. She also rents it out to other groups too like baby massage, etc. If you have some sort of space like that I could see it being a viable business but if you have to hire a space out I don't think you'd make a profit.
Google Crumb and Play, Lichfield.
@Rhiann yeah, something like that
How much a people willing to pay for this? Daily fees? Monthly?