it is thought that biochemical changes in the uterus have an impact on the baby「s development, affecting its birth weight and even its future risk of disease, among other things.
alongside that trend are signs that average birth weight is also headed upward.
紧跟着这种趋势的是婴儿的出生重量也在上升。
prior studies have indicated that babies born to older women have higher risks of birth defects, low birth weight and certain chromosome problems, such as down syndrome.
contrary to old beliefs, however, research shows that ordinary day-to-day job and home stress isn」t likely to cause low birth weight or other problems for most women.
even with that margin of error, desilva says, it was clear that the birth weight of australopithecus infants was much closer to the 6 percent of modern humans than the 3 percent of apes.
other experts have cited factors like parental age, multiple pregnancies, low birth weight and exposure to medications or maternal infection during pregnancy.
其他专家还引述了例如父母年龄、堕胎妊娠、低出生体重以及怀孕期母亲感染和药物治疗之类的因素。
「low birth weight is associated with a bunch of poor outcomes throughout your life cycle,」 torche said.
「低出生体重与整个生命周期中的一系列负面影响有关,」托奇说。
it is thought that biochemical changes in the uterus have an impact on the baby「s development, affecting its birth weight and even the child」s future risk of disease, among other things.
the study, published by the british medical journal, found 「no significant differences」 between the two groups for birth weight or length of pregnancy.