“Some people believe that the risk of vaccinating babies for a few viruses at once is greater than if done one by one. It makes sense, but I don’t have any data on this.”
Actually no, it doesn’t make any sense. Why would anyone think this makes sense?
It’s a lose lose with anti-vaxxers. If they combine to one shot, they’ll complain that it’s too many diseases at once. If they split into 3 shots, they’ll complain it’s too many shots. There’s no cure for stupid.