Diana Vilibert. In African-American girls the mean age of onset of breast development apparently is 1 year earlier; while ethnic differences in fat mass maybe a factor Kumanyika, , the nature of the discordance is uncertain. As mentioned earlier, a significant sex difference in fetal pituitary gonadotropin levels and the high circulating testosterone levels in the male fetus through the 24th week of gestation are the most prominent features of the hypothalamicpituitary-gonadotropin-gonadal system. According to WomensHealth.
But while it might be good for your self-care routine, that bubble bath might not be so great for your vagina. Differentiation of the Genital Ducts At the 7th week of intrauterine life, the fetus is equipped with both male and female genital ducts derived from the mesonephros. Clearly, studies that address the mechanisms that underlie the development of these differences as individuals age could yield important information of benefit to both sexes.