One hundred boys and 100 girls born in Wrocław, Poland from 1973 to 1975 were measured every month during the first year of life and every three months during the second. Body length and weight and head circumference were examined. The statistics of values of the traits and their increments and some of the correlation coefficients are given in the tables.
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Krzysztof Borysławski (1988) studied this question.