Do you send a thank you note for a card? I've received a few cards congratulating me from my direct reports. I'd like to acknowledge their well wishes, but it seems weird to send a thank you card for a card. What's the verdict?

I can't get the ticker to work, but I have two sons:
Baby RJ, born 1/25/2014
Formerly Twilightmv
Re: I should know this. Thank you note related.
This