Opening Minds, Year 7 Science, instructions to teachers. Note the section about measuring babies' heads, its been done before, and is described as 'Anthropometry', from the 1921 eugenics conference.
From the following document, page 9: 'Measure the head size (chin to top of head) and the body size (height) of up to ten children or adults'
Measuring the humans here:
Anthropometry demonstrated in an exhibit from a 1921 eugenics conference: