Don't get me wrong, I love the fact you plan on taking off beforehand, and 3 months is awesome after baby is born, but most sick leave policies don't let you use sick leave for this purpose. I'd check your works policies. You're typically allowed to use sick leave for 6 weeks afterwards to care for your wife due to her incapacitation, which most doctors say is 6 weeks. Some liberal policies allow for use of sick leave for bonding purposes with the child. This seems more like a babymoon vacation, unless you're planning on triplets or something that would be causing bed rest for the preceding 6 weeks. Regardless, good luck with the kid!!