On the InTEEN site there is a section called "Jordie's Chop Shop" where some of the more popular mods (like squinge's Pregnant Sims Wear Anything) have been "InTeened", so they will work with InTEEN. (Some of them need to be in the same folder as InTEEN & some don't, but the directions are always spelled out clearly. )
As for replacement for the...
interesting default maternity wear, there are actually quite a few nice sets (default & "hack enabled" ) over at MTS2. Here's a link:
http://www.modthesims2.com/quicksear...?tag=maternity
I'm thinking of installing the Sundress Replacements (second file down) since I'm getting real tired of the same old outfits.
(Miros1- is deleting tumbnails okay to do? If so, what is the reason for it? )