Same-sex twins are taller and heavier than opposite-sex twins (but only if breastfed): Possible evidence for sex bias in human breast milk.
Sign Up to like & getrecommendations! Published in 2017 at "Journal of experimental child psychology"
DOI: 10.1016/j.jecp.2016.11.014
Abstract: Recent studies show that human and other mammalian breast milk may be tailored for the sex of the offspring. Such sex bias suggests that opposite-sex twins, who receive breast milk that cannot simultaneously be tailored… read more here.
Keywords: opposite sex; sex; breast milk; sex twins ... See more keywords
Birth size and gestational age in opposite-sex twins as compared to same-sex twins: An individual-based pooled analysis of 21 cohorts
Sign Up to like & getrecommendations! Published in 2018 at "Scientific Reports"
DOI: 10.1038/s41598-018-24634-2
Abstract: It is well established that boys are born heavier and longer than girls, but it remains unclear whether birth size in twins is affected by the sex of their co-twin. We conducted an individual-based pooled… read more here.
Keywords: sex twins; twin; birth; sex ... See more keywords