This question sent us asking Alan, the Lab Historian, for help:
I received the following reply this afternoon from our historian. I am astounded! The 80 in the first year would mostly have been conceived off 'the hill.' The Manhattan Project arrived here in March. Many of the rest would have been the result of local efforts.
Quoth Alan:
"I haven’t been able to find an exact number, but you might find this quote from Jon Hunner’s, Inventing Los Alamos, helpful:
'Eighty babies were born the first year, and ten newborns arrived every month thereafter' (p. 39)
That’s essentially a shade under 300 babies born in Box 1663 during the war."
