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August 1986

Familial Sexual Precocity-Reply

Author Affiliations

Rainier School Department of Social and Health Services Buckley, WA 98321-0600

Am J Dis Child. 1986;140(8):742. doi:10.1001/archpedi.1986.02140220023018

In Reply.—Growth and development are greatly genetically determined. There is good correlation of the timing of menarche between mothers and daughters.1,2 The correlation of growth between girls and their parents is higher than that observed between parents and their sons.3

The occurrence of early mother and daughter sexual development is commonly observed by pediatricians, but true familial sexual precocity (before the age of 8 years in girls) is indeed rare. Breast development is usually one of the first secondary sexual characteristics observed in girls. The mean interval from beginning of breast development to menarche is 2.3±0.1 years.4 The mothers of the propositi of Drs Rohn and Rousonelos' patient reports 1 and 2 had menarche at around 10 years of age; consequently, it is quite possible that the onset of puberty in these mothers took place at approximately 8 years of age. Puberty at about this age

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