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Women with female first born children are more likely to be single parents.
In the group of the 37 index cases, 26 (70%) cases were first born children.
Fifty four percent were male and 46% were first born children.
Furthermore, cord blood levels of estradiol, estrone, and progesterone are lower for later born than first born children [ 82].
The relative risk ranges from 0.73 for second born to 0.74 for third or fourth born until 0.56 for at least fifth born with first born children are the reference.
There was, however, no evidence of differential reporting of sick days for the first born children in our data as there was no statistically significant interaction between birth order and number of sick days.
Similar(52)
Some studies found significantly lower risks for second or later born children versus first-born children [ 31, 46].
The odds of fracture increased with increasing birth order (test for trend p<0.0001), with fourth or more born children having a threefold greater odds of long-bone fracture than first-born children (OR 3.12, 95% CI 2.08 to 4.68).
"There's a lot of psychological literature on why first-born children are most successful.
A new study shows first-born children are more able and ambitious.
Conventional wisdom says that only children are lonely, maladjusted and selfish, and that first-born children are bossy overachievers.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com