Even if it is well known, I don't think baby gifts are appropriate for a wedding.

How about a coffee table book, or a magazine subscription? Or flowers/plants to be delivered every other month for a year? Or cheese of the month? ( I am assuming wine is out of the question until after baby is born.)

For a formal wedding (any wedding -- but especially a formal one) the gift should be sent to the home and not taken to the reception. It makes it so much easier on the bridal couple!