I really like Fancy Pants' baby mine. It's a collection including papers and matching embellishments. You'll probably just have to add solid cardstock papers. And depending on how many pages you'll make, you have to buy multiple sets.
Is that something you're looking for? If so, just search here in the store. Type "Baby" and set your filter to "Kits". You'll see many baby kits.
Michaels or any scrapbook store will have tons of baby kits too, usually including papers, stickers, words, borders, etc for you to make quite a few pages. But I want to make so many pages I don't think any one kit would fit my needs. I buy a few of them and many solid cardstock paper in blue, green and white so I can mix and match.