In the last few years I have gotten to photograph many maternity sessions, overall I've found the most important thing to remember while shooting a maternity session is to capture the couples excitement and anticipation about their little one on the way. Maternity sessions are unique because they're about the parent(s), they document the journey the mother has experienced physically, and they're all about setting the tone for someone who is yet to be introduced to the world. If you ask me, they're a perfect storm of emotion, of working towards a common goal to set up a good life for this little one, of being intentional, of sacrifice, and of course of love.
2) For poses with movement, walk the couple through it and do a "test" run first: I love me some dancing pictures, especially with that cute baby bump but unless you grew up as a practicing dancer this is usually new to many couples. The key here is keeping everyone safe. I like to explain the motion, offer a demonstration, and then ask the couple to follow suit.
3) Don't just make it about the bump: This may sound like an intuitive one, but if you aren't intentional about it during the session you might find you lack variety in post production. What I mean by this is to pay attention to how the couple is already interacting with each other and additionally with the baby bump. Focus on what their chemistry already shows you and then tie it all together. I like to mix in a few photos where they may not be thought of as "traditional maternity" photos because it gives them a few for just themselves.
Bonus: Bring along a bluetooth speaker to liven the mood by playing some of their favorite music.
Check out my pinterest board for posing ideas: