TIS, was their first child a masculine child?? grin
I'm not aware of any particular superstitions regarding Feb 29 babies. Birthdays in our family are pretty strange. My Mom and brother share a birthday (May 6). Other birthdays include brother (July 18) Dad (July 19) brother (July 20). This last brother has a daughter also born on July 20 (his wife was born on July 22). I also have nephews and neices born on Christmas Day, Feb 29, April 1 (a little April Fool to be sure)and July 4 confused

Tom: "They shot Sonny on the causeway...he's dead."
Michael: "Turnbull is a good man"
Shane MacGowan: "It was Christmas Eve babe, in the drunk tank"