The CPHMINIPUB aims to assess genital development and growth, including hormonal, genetic and environmental exposure in infants, to understand early postnatal changes. Participants included over 200 newborns and their mothers and fathers from Copenhagen, Denmark, who were assessed between 2016 and 2018. Mothers and fathers were examined during pregnancy and followed up once at the child's birth. Newborns born on odd calendar dates were invited to follow-up visits around one, three, five, and seven months of age. In contrast, those born on even calendar dates were invited to visits around two, four, six, and eight months of age, with all groups following the same examination within six visits and having a final visit at twelve months.