How to pronounce 'breadth'?

The "d" is not silent. Think of the word "bread" and add a 'soft' "th" at the end of it.

But I always hear people say 'width' without the 'd' sound, why?
Should we say 'breadth' into the 'breath'?

The 'd' is really soft: almost nonexistent, but certainly there (just as it is in 'width').

Thanks for your confirmation, IFrank.

I believe I actually do not say a [ d ] at all, but rather realise the /d/ as a glottal stop. Thus [br\E?T].

I pronounce width as if it had a 't' in place of the 'd'--like "wit", with a "th" at the end.

Breadth is pronounced with the "d" but it's more like half of the "d" sound, not even quite that. Instead of pronouncing the entire "d" sound, you only pronounce the beginning tip of it. It's just like saying bread, only as soon as you begin the "d" sound you move into the "th" sound. Basically you just touch your front teeth together right before pronouncing the "th" sound.

Using a Critical Pronouncing of the English Language, by John Walker, from 1849, page 59, we have the following: "dth" disaperars, in spite of authorities to pronounce the "d".