J Exp Biol 11 : — An oft-cited report suggests that girls have more mature skeletal systems at birth Tanner, There is a report that women carrying boys performed better on three of eight neurocognitive tasks as compared to women carrying girls, which happened to represent the most challenging tasks of the battery used and related to verbal, spatial and arithmetic working memory Vanston and Watson, Glycerylphosphorylcholine diesterase activity of uterine fluid in conditions including secondary sex ratio change in the rat.
We study gestation sex determination in Poole it changes from birth to late life; the forces that change the ratio of men to women. Verme LOzoga J.
But we see a much more significant skew in the ratio for second or third-born children. Hammond J. Meikle D , Westberg M. But through time and across the world, this can often vary between to male births per female births.
Unimpaired outcomes for extremely low birth weight infants at 18 to 22 months. Housing pregnant females under crowded conditions reduces sex ratio fraction of male offspring [ 63 ], while mating at first postpartum estrus tended to produce more males [ 66 ].