They were happy because Nina and I were happy.
That was such a sweet post , Big Tex. That's basically the reason why I say "congratulations" to parents-to-be of either sex.
For example, I recently gave my "congratulations" to Trauma Hound because I was "wishing [him] joy" (thanks for that definition, Minimus). It brought a smile to my face to see the ultasound he was sharing; and for a while, his joy became my joy, and I congratulated him because I wanted him to know that I was so happy for him.