I'm a stay at home mum too and I opt to send my daughter to playgroup when she was over 2yrs old. I found that I wasn't able to give her enough mental stimulation and she was getting bored at home. I purposely looked for one that did not incorporate a childcare. I liked the fact that class ends the same time for all the kids. It is a Montessori Kindergarten that offers playgroup starting from 18mths. Now she has moved on to Nursery 1. She seems to enjoy school and that's what's important.