Nice concept. I'd like to see it in a color, too. Preferably one that is warmer/softer/friendlier, since the audience will be couples who are longing for a child. Colors can evoke emotions. Just my two cents.
I love the air balloon mark and the overlapping colors. Might need to tweak the colors a bit, since it gets a bit "muddy-colored" in the middle.
Sprung!
It's a good logo. Good rendering of the origami crane without being typical origami. It has a strong visual presence too. One suggestion is to take out the little line/shape on the bird's mouth (or is that supposed to be a part of the wing?) It was the first thing that caught my eyes, since my brain tried to figure out what it was.
Congrats on the sale! Nice one.