Girls With Twin Brothers Pay A Price For Sharing A Womb
When a son and girl are conceived together , the distaff twin is disclose to more manlike hormones in the uterus than when both twins are girls . This has allowed researchers to essay the much - fence impact of these internal secretion prior to birth . They have found that there is a small , but statistically substantial , minus impact on life history outcome from nine months in close confinement with a male child ....