Is this correct?

Womb
My wife has a baby in her womb.
Welcome.

Thanks Elena
Is that a technical word or a common usage?

I've just read on the net that stomach is used in a colloquial way in some books and TV shows.

Let's wait for more answers.
In the meanwhile, womb is the right word for me, as if using stomach we are telling a lie and if using belly we are not being very precise.

Native British speakers view:

Both sound a bit odd to me. We would just say 'my wife is pregnant'.

The only time these sorts of phrases are used is to explain pregnancy to small children. for example a young child will be told that 'mummy has a baby in her tummy' or that 'babies grow in mummies' tummies'. Tummy is a completely non-offensive word for this area and is the usu

Thanks!
Thank you for the clarification and for the info about the use of belly/tummy.