How about a Baby Swap?
I have a lot of books with babies, but my most popular has been my baby swap duet, the Wrong Heirs.
Cesar has amnesia and doesn’t recall making love to his P.A., Sorcha. His first inkling that he’s a father arrives with the hospital phone call requesting he submit to a DNA test to determine which of the switched babies is his.
Of course the baby is The Consequence He Must Claim.
If you like to read in order, start with The Marriage He Must Keep.