Also - re: vasectomy reversal. If she is really serious about wanting another child, these statistics may be important for you both to know: "It's estimated that the success rate of a vasectomy reversal is: 75% if you have your vasectomy reversed within 3 years. up to 55% after 3 to 8 years. between 40% and 45% after 9 to 14 years."
