Congratulations, That is what life is all about. Family! All the best and may the baby be healthy and prosperous.
If I was to go this route, I would probably take a couple of photos of people myself, pay them a fee and let them know where the images will be used and also let them sign a model release just to keep things on the up and up.
I have personally never seen any author leave the image of a model in the final download. And if you want to buy a license for the purpose of including it in an item, it will cost you more money than you will make.
Congrats, keep working hard!
What an awesome way to kick off 2015. Wish you all a successful year with lots of sales.
Thanks so much to each and every one of you! All the best.