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In early postnatal life, it is transiently active during which circulating sex steroids reach adult levels. While this so\u2010called minipuberty represents a universal phenomenon in infants of both sexes, its role for early maturation and growth remains incompletely understood.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To provide normative data on auxology as well as serum and urinary hormone levels in healthy, full\u2010term infants throughout the first year of life and to investigate associations of postnatal HPG axis dynamics as well as hormonal, genetic and environmental exposures with early genital development and growth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Population<\/jats:title>\n                    <jats:p>Healthy, Danish, full\u2010term, singleton newborns including their parents.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Single\u2010centre, prospective, observational longitudinal pregnancy and birth cohort.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Newborns were followed with six repeated clinical examinations during a one\u2010year follow\u2010up period. An umbilical cord blood sample was drawn at birth. At each visit, infants underwent a clinical examination focusing on auxology and genital development. Further, blood (serum, plasma, DNA) and urine samples were collected at each visit. Mothers and fathers underwent a clinical examination and provided blood samples prior to and after birth. A subset of parents provided urine samples and breast milk samples. Pregnancy and obstetrical outcomes, and detailed parental questionnaires were compiled.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Preliminary results<\/jats:title>\n                    <jats:p>Between August 2016 and August 2018, 2481 women with singleton pregnancies were invited to participate of which 298, including their partners, were enrolled (12.0%). A total of 268\u00a0healthy, full\u2010term newborns born appropriate for gestational age (AGA) were included at birth, 233 newborns participated in the postnatal follow\u2010up period and 186 completed the one\u2010year follow\u2010up period (9.4% and 7.5%, respectively).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The COPENHAGEN Minipuberty Study provides detailed, longitudinal data on early genital development and growth including hormonal and genetic profiles and environmental exposure in healthy infants including additional data in their parents.<\/jats:p>\n                  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