Hello,
my name is Liliana, i have over ten years of experience as a designer, and what i like most is illustrate, that's why i like this project.
Please, visit my Freelancer portfolio https://www.freelancer.com/u/webpolis.html
to see some of the illustrations i made, in order to evaluate my work.
I can send you more samples, if you want to.
I use Illustrator for this kind of projects, i can deliver you the images as vector format ready to print on the size that you need, and also saved as any other format you may need, like JPG or PDF.
I found this project really enjoyable and interesting, and i would like to create an original, nice and fun illustration of your wife and baby on her belly.
I hope we can work together, please, contact me if you have any questions, or if you want to see some more of my work.
Best regards.
Lili.