Teach me -
Is this blessing like a baptism, or like an invocation and introduction to the congregation? Is the Holy Spirit invoked?
Being formerly Catholic, I am not familiar with many other denominations, so if you give me some more information, I may be better able to suggest a few things.
Theresa 
It is not a baptism. It is like a prayer, invoking the Holy Spirit, and asking a blessing on the baby. What is said in the prayer is up to whomever is giving it, but usually a blessing of health, and strength, and a knowledge that the baby is loved by his family, and Father in Heaven are mentioned. I know I can do something in the "baby" category, but I'd like to have at least something clever and sweet to write on the cake.
I think this quote is sweet:
"Babies are a link between angels and man."
-anonymous
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