But most infant deaths before 1900 were from infectious diseases that didn't even exist in human populations until our ancestors lived in large enough groups to

But most infant deaths before 1900 were from infectious diseases that didn't even exist in human populations until our ancestors lived in large enough groups to become disease reservoirs. But your response just proves the meta-point I made, in my earlier comment... If you don't have any qualifications in Neolithic anthropology, and you're not citing any evidence from people who DO have those qualifications, then your uninformed speculations are just fairy tales. In not against unqualified speculation... Just don't be surprised when people point out that you have no idea what you're talking about, and that you're probably wrong.