My SO has been a father to my kids for the past year in every sense of the word. My kids are just toddlers, the oldest being 4. They have only seen their dad once in the past year and have talked to him a handful of times on the phone. My SO has been with my "baby" (2 and a half) more than my ex ever has.
My SO is great with my kids. He does everything a biological dad would. He loves them and they love him. I mean, when he decided to buy a house he bought a 4 bedroom home with specific rooms in mind for my kids.
Anyway, I am pregnant with his first child, a little boy. But would it be appropriate for my kids to get something/make something for my SO. I am getting him a folding picture frame with his favorite picture of my kids in one frame and a sono in the other frame, but what would you get your kids to do, if anything, if you were in my situation?