The autism link has been comprehensively, utterly, totally discredited.
Let me just say that NO serious medics/scientists are debating this issue - there is no conflict in the medical world. There's a lot of shit on the Internet, but you know that anyway..;)
Vaccines do NOT cause developmental delays. They do not cause autism, they do not trigger autism. What they do is prevent you and your previous, vulnerable babe from getting potentially lethal diseases. Whooping cough kills - it almost killed me as a baby. For a healthy adult it's a miserable thing to get, you'd feel shit for weeks. For a newborn, it's life threatening.
The vaccine has a really great safety profile (all drugs and vaccines are monitored for many years after release - if that surveillance picks up issues then they are collated and action is taken. So far the WC vaccine has 'slightly sore arm for a bit' as the major one :) )
Whooping cough is on the increase as the antivaxx lobby spread their lethal misinformation. It comes in waves of roughly four years and 2015-2016 is likely to be a peak.
Please, please, please get the vaccine. There are no downsides, only benefits. Grocery shopping, a bus ride, all possible exposures. Living in a rural area isn't much protection. Lowered vaccine rates and the 'I'll be ok' mindset are very dangerous.
It's not flu season yet, but when it is, get that too!