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. 2015 Feb 26;6:3. doi: 10.1186/s13293-015-0022-1

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© Hines et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Median urinary testosterone concentrations in male and female infants from 7 days to 6 months of age. Error bars represent the interquartile range. Testosterone was measured at day 7 postnatal (D7) and then monthly from 1 month (M1) to 6 months (M6) of age. Urinary testosterone was measured using HPLC-tandem mass spectrometry. Urinary testosterone concentrations are higher in boys than in girls, and testosterone peaks in boys at 1 month of age, is lower before and after this age, and declines to baseline by about age 6 months. The figure is reproduced from [78] by permission of Elsevier.