While vaccine experts note that vaccine hesitancy exists in these regions, they say that’s not the main reason that children miss vaccinations . “Eventually, you succumb to the inability to breathe properly and oxygenate your blood,” Conway says. The danger doesn’t end with pneumoniaLooming over unvaccinated children is yet another deadly threat: diarrhea. But that doesn’t mean a child will survive unscathed. But if the person giving birth doesn’t have immunity to tetanus, non-sterile delivery practices can result in neonatal tetanus.