M.G.
I personally would not get this vaccine. When ds (now 2) was 2 months old the ped's office was not giving it due to a bad batch or something. (and if you don't start the 3-part series at 2 months, it is not given at all) We never had any problems.
Since you stay home with both of your children, they are much less likely to contract this disease anyway. And if you are breastfeeding, the chances of him getting it are even less.
Good luck with you decision!