I used to use another site and they had age related topics so baby & toddler sections 0-3 months, 3-6 months, 12-18 months, teenagers and so on. They were quite active and great for posting general baby related stuff relevant to age.
I know there's sleep section and behaviour and development but sometimes it's more general stuff I want to post about. It can be really good to speak to people with dc the same age.
Mumsnet would you consider trialing something like that?