No it can't because there is no direct, empirical relationship between children born in neglectful or under-resourced households and medical illness in other children. You can mount an abstract argument that there are secondary or tertiary effects that increase e.g. crime, violence or what have you. But that kind of relationship is not nearly as tight nor as evident as the reduction in herd immunity effected by fewer children receiving vaccinations.

It's a difference of category, not degree.

Abortions don't create negative externalities like the anti-vaxx crowd does.