Just once I'd like to hear some parent say, "My kid? Oh, he's just your basic kid." But no. Everyone's got an Einstein with a great sense of humor, unusual empathy for others, and a stubborn sense of self. Boring! Anyway, that's not really what you want to say to the new parents, so "Congratulations," along with all the usual baby crap (bottles, those safety pins no one uses anymore, little duckies, little bunnies, etc.) arehand-stamped inside.
It's perfect for the new parents, who will be too exhausted to read or appreciate it.