Was just thinking the other day about vaccinations, and whether there are any more I should be getting for my boy. He's had whatever they typically give at 6 & 12 weeks, though they did mention a few optional ones like lepto\tetanus. Are there any more I should be getting him at 12 months of age? Are these optional ones good to have or just a waste of money? Do you usually have to get previous shots re-done after time? Not sure ..