How early did you know something was up?

[onthefly]

I think mums are generally the first to know if something is off. It might be something, it might not be what you think it is, but it's probably worth further investigation.

[Three Graces]

I second what MadB said about mother's knowing if something isn't quite right. You're not being ridiculous, just concerned for your DD.
I'd say ask your maternal health nurse or GP (or both) about it and see what they say. I know that it's too early to diagnose for something on the Austism spectrum, as a few of the criteria relate to social and language skills etc. Still, if you're worried, I'd be asking for advice.

[MummyNaomi]

Mum's know - I was worried about my DSs physical development from about 3 months, at 5 months I took him to see a paed and after xrays and investigations we discovered he was low toned and had hip dysplasia. Now he has had physiotherapy and wore a hip brace for 6 months and is a perfectly healthy 3.5yo.

If your instincts are alerting you to something, get it checked out asap, as early intervention in mental/physical development issues is often crucial to sorting things out/ or getting ongoing support