I am an active user on Cognitive Sciences, and in the midst of establishing a tag on parenting, stumbled upon the section of your FAQ advertising "sister sites" on the exchange.
We would like to offer our site as a resource for asking child psychology and developmental psychology questions that might be on your users' minds, but are too theoretical to be on-topic for Parenting. The only minor limitation is that we discourage "self-help" questions, as those would be best answered by a professional.
Our developmental-psychology tag is fairly active, with 24 questions, including:
What is the effect of motherese on development?What is the effect of motherese on development?
Do fetuses exhibit pattern recognition in utero?Do fetuses exhibit pattern recognition in utero?
To what extent are correlations of father's age with birth defects and autism causal?To what extent are correlations of father's age with birth defects and autism causal?
and more!
Our parenting tag is just getting started, but includes:
Do men and women differ in their desire to have children?Do men and women differ in their desire to have children?
Do victims of bad parenting become bad parents?Do victims of bad parenting become bad parents?
and more!
We have an existing question on our Meta about getting involved, so you are certainly welcome to leave your comments or concerns on this question or that one.