This pose is based on the feeling, sometimes joked upon, that a pregnant woman, late in her pregnancy, feels like her belly proceeds her into the room. It is fun and captures a dramatic entrance. It also provide a visual measure of the mom-to-be's belly.
This pose works best in the home, rather than the studio, making use of a door, doorframe or wall, or even outdoors using a tree.
Parents-to-be have an advantage here as this is a photo that requires very little set up and works best as late as possible. The bigger the belly, the more effective the photo will be. This isn't always the case, but here is a pose that is actually great for moms of multiples.
There are a lot of other positive with this pose as well. It does not need to include the mother's face or expression (though it can). It is very low pressure in terms of the mom-to-be feeling comfortable in front of the camera.
The photo in it's simplest form is simply the belly, protruding on it's own. If you mouse-over each of the photos below, you can see some of the differences relative to each mom-to- be, their clothes and their pose.
In these examples, we see nothing but the belly. This can give the belly a life-of-its-own quality. However, as with other photos that feature only the belly, it can also be abstract or, in the worst cases, anonymous. You will get the most dramatic results by having the mom to arch her back and push the belly out as much as possible. This will give you the maximum amount of belly protruding out from behind the corner.
It is worth noting that the distance of the camera and the angle of view can make a big difference and these are factors worth experimenting with.
Each of the examples above hide everything but the belly. However, the photo can be just as effective showing the mom-to-be's face. In the example on the left, we see her peeking out from around the corner. It is a very nice way to connect with the subject of the photo.
However, this variation on the pose will not work for everyone. Getting the belly out from behind the door while still showing the mom-to-be's face can present something of a challenge. It works best if, as noted above, the belly is in a more "profound" state. Some pregnant women won't get big enough to do this pose as effectively.