You're not trying to attack, but the BEST way to describe how you feel about this pictures is "nauseating" - are you for real? You ARE for real, and that's what makes your post nauseating (see how I used it there, I feel sick that someone would think the above post should even have been submitted).
As the OP indicated, he knows there are serious issues with the photos here; its kind of why we call this a BEGINNERS FORUM - something you seem to have missed in the whole being nauseated issue.
Christ almighty, some of you need to seriously get your heads out of your asses.
To the OP, yes you got issues here man. Try and do a search for other maternity shots. I'm not saying ape them angle-for-angle (although you could) - but see what other people are doing. Also, what lenses are you working with here, that can go a long way in getting some help here.
About the only one I would I would keep is #4.
The rest have some serious contrast issues, the poses are not very flattering, or you've got that dog gone on camera flash hitting them dead on. If you are SERIOUS about giving these guys materinity shots (and you can do it), see about getting them in front of a more flattering background, get that flash off-camera, and a more intriguing wardrobe.