K.S.
I had the same problem with the 2nd one. I sent the announcement out 5 months late.
I used a little desktop publishing, and created a phony newsletter that was from the SCSS...The Second Child Syndrome Society. The newsletter had mini articles about our newborn. A feature on his birth. A snippet about his favorite things. A list of his milestones. You get the idea. I even mocked up a phony logo and imprinted it on the newsletter and the envelope. I told the recipeints that the SCSS existed to ensure that non-first borns get the same kind of care -- In this case, to make sure they don't get ganked out of a birth announcement just cuz mom and dad are tired. It was a hoot.