Unexpected changes in maternal breast size during pregnancy in relation to infant sex: An evolutionary interpretation

@article{Galbarczyk2011UnexpectedCI,
  title={Unexpected changes in maternal breast size during pregnancy in relation to infant sex: An evolutionary interpretation},
  author={Andrzej Galbarczyk},
  journal={American Journal of Human Biology},
  year={2011},
  volume={23}
}
  • A. Galbarczyk
  • Published 1 July 2011
  • Medicine
  • American Journal of Human Biology
Objectives: This study evaluated changes in breast size during pregnancy depending on infant sex. Due to larger nutritional needs during lactation, male infants may stimulate greater changes in maternal breast size than female infants. 
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References

SHOWING 1-10 OF 18 REFERENCES
The influence of breast surgery, breast appearance, and pregnancy-induced breast changes on lactation sufficiency as measured by infant weight gain.
TLDR
The findings from this study indicate that certain biologic and surgical breast variables are associated with lactation insufficiency. Expand
Infant sex predicts breast milk energy content
TLDR
It is found that mothers of male infants produced milk that had 25% greater energy content than mothers of female infants, and greater nutritional investment in sons may account for the greater observed growth rates in male compared to female infants. Expand
Anatomy and Physiology of the Breast
TLDR
The mammary gland is classified as a branched tubuloalveolar structure with hormone-responsive lobules surrounded by a loose connective tissue stroma, which completes the majority of its development after birth undergoing hormonally regulated changes during puberty. Expand
The nubility hypothesis
A new hypothesis is proposed to explain the perennially enlarged breasts of human females. The nubility hypothesis proposes that hominid females evolved protruding breasts because the size and shapeExpand
Intrauterine growth curves based on ultrasonically estimated foetal weights
TLDR
New growth curves are presented based on data from four Scandinavian centres for 759 ultrasonically estimated foetal weights in 86 uncomplicated pregnancies, revealing better the true distribution of SGA foetuses and neonates and are suggested for use in perinatological practice. Expand
Maternal serum HCG is higher in the presence of a female fetus as early as week 3 post-fertilization.
TLDR
Because a fetal gender-related difference in MSHCG can be demonstrated as early as week 3 post-fertilization, the difference may be attributed to placental factors and not to the effects of the fetal hypothalamic-hypophyseal-gonadal axis. Expand
Richer milk for sons but more milk for daughters: Sex‐biased investment during lactation varies with maternal life history in rhesus macaques
  • K. Hinde
  • Biology, Medicine
  • American journal of human biology : the official journal of the Human Biology Council
  • 2009
TLDR
The data indicate that selection has likely favored sex‐specific regulation of growth and development that is not necessarily contingent on greater maternal investment, and this is especially true for young mothers that initiate reproduction shortly after adolescence. Expand
Large breasts and narrow waists indicate high reproductive potential in women
TLDR
It is documented that women with higher breast–to–underbreast ratio (large breasts) and women with relatively low WHR (narrow waists) have higher fecundity as assessed by precise measurements of daily levels of 17–β–oestradiol (E2) and progesterone. Expand
Mating in the rhesus monkey (Macaca mulatta) after conception and its relationship to oestradiol and progesterone levels throughout pregnancy.
TLDR
The positive relationship found during the menstrual cycle between the ratio of circulating oestradiol: progesterone and degree of sexual activity continued for the first 8 weeks of pregnancy, however, sexual activity ceased in the second half of pregnancy despite a continued high oestrogens: progestersone ratio. Expand
Social behavior and genital swelling in pregnant chimpanzees (Pan troglodytes)
TLDR
Analysis of additional data from seven pregnant and eight cycling females indicated that tumescent pregnant females differed from cycling females in some social interactions with males, and pregnant females were more receptive to male‐initiated copulatory bouts. Expand
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