My daughter is 3 years old and can only say a couple of words, she thinks momma is all women and nanna(banana)is all food ,dadda is all men, that's all she ever says, her birth mom and dad both had mild learning difficulties, she shows little affection ,constantly wants food ,is still in nappies, never sleeps in the day but sleeps 12 hours every night, understands everything you tell her but she doesn't know danger any ideas please ,tony

Has she been evaluated by a Physician?

You wrote "birth mom and dad". I'm assuming that she's adopted.

How old was she when you adopted her?

Being in diapers at 3 isn't that uncommon anymore. Remember that potty training is not a sign of intelligence. It has to do with learning the feelings your body is sending out. It doesn't mean that she's delayed in any way.

The speech is a concern, but not something that can't be worked on. Judy's recommendation to see a doctor is the best bet. The sooner you get help with her speech the better off she'll be in the long run. Many kids are in speech therapy nowadays.

Get her assessed by your doctor first. That's the logical first step. :)