Newborn boys have higher rates of infection, sepsis, and have poorer survival compared to their female counterparts. The cause of the difference in newborns can be found in the chromosomes, with females carrying two copies of the X chromosome (XX), and males who carry one X and one Y chromosome (XY).
The battle of the sexes begins at birth, with newborn girls more strongly genetically programmed than boys to withstand acute infection. A new study shows newborn girls have an innate genetic advantage when it comes to potentially dangerous infections.
Male firstborns are more likely to survive than female firstborns, but only during the neonatal period. Finally, mortality is not affected by the interactions between biology and climate or between biology and social status.
By most measures of sensory and cognitive development, girls are slightly more advanced: vision, hearing, memory, smell, and touch are all more acute in female than male infants.
It all comes down to biology: Girls just happen to be born with more chemical resilience to stressors. Since boys have less resilience, they're more at risk for neuropsychiatric disorders like autism, early onset schizophrenia and attention deficit disorder.
Are Moms Of Girls Happier Than Moms Of Boys? Moms who have girls are much happier than those with boys, particularly when the children reach early adulthood, according to a study from the Journal of Family Issues. However, a survey done by Gallup says: 54% of Americans say boys are easier to raise than girls.
Professor Greene said: “The phenomenon of female neonates being hardier than their male counterparts is well recognised. This research shows this is due to a fundamental genetic advantage which may also contribute to more effective responses to infection and disease throughout the human lifecycle.
Anecdotally, many parents say boys reach gross-motor milestones like sitting up, cruising and walking earlier than girls, but some pediatricians swear the opposite. Yet both are wrong: Studies show no significant differences between boys and girls when it comes to these motor skills in infancy.
But that's not exactly true – there's actually a slight bias toward male births. The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO). This means about 51% of deliveries result in a baby boy.
Researchers have found few differences between boys and girls in brain structure or function. Boys have larger brains, and girls' brains finish growing earlier than boys' do.
The key to the research is this: Male embryos and fetuses are known to be weaker. So trying to bring a boy into this world under hardship would be disadvantageous, in terms of survival of the fittest, compared to having a girl.
Now, three centuries of historical records show that women don't just outlive men in normal times: They're more likely to survive even in the worst of circumstances, such as famines and epidemics, researchers report.
In times of trouble, multiple studies have shown, more girls are born than boys. No one knows why, but men need not worry about being overrun by women.
When we look at the statistics the chances of having a boy or a girl are almost the same and there's no medical evidence to suggest we can influence this. You may, however, have heard about the 'Shettles Method'.
Male births were much more likely to require the use of oxytocin, a hormone which stimulates contractions. "Of the women carrying male infants, 70 per cent of them had completely normal deliveries, compared to 76 per cent of females."
Only 7.6 percent percent of male babies and 5.5 percent of female babies were in the womb 42 weeks or longer. Males were also 1.5 times more likely to be born at 43 weeks or longer. The researchers noted that the most common reason for prolonged pregnancies is an error in calculating the due date.
It is simply a matter of chance as to which category of sperms fuses with the ovum. If the egg (X) is fused by X-bearing sperm, the resulting combination is XX, i.e. female type, and the child produced is female (daughter).
What the Research Says. Where early talking is concerned, it may be linked to giftedness. The Davidson Institute cites a study showing that among 241 “profoundly gifted” children, 91 percent started taking early. On average, they said their first words at age 9 months.
The first three months with your baby often seem the hardest. Sleep-deprived parents can feel overwhelmed, but that is normal and you will quickly learn how to read your baby's cues and personality. Don't worry about “spoiling” your baby at this stage. The more responsive you are, the more secure your baby will feel.
Every stage of parenting has its challenges, but one poll reveals what age most parents feel they struggled with the most.
Biological sex in healthy humans is determined by the presence of the sex chromosomes in the genetic code: two X chromosomes (XX) makes a girl, whereas an X and a Y chromosome (XY) makes a boy. In this way, it is the presence or absence of the Y chromosome in a healthy human that differentiates boy from girl.
A sperm carrying the X chromosome of the man will become a female embryo whereas a sperm carrying the Y chromosome will produce a female embryo at conception. In theory, men produce equal numbers of X and Y sperm which means that the sex ratio at birth should be 50:50.
Want to be a happier parent? Grow your family to at least four children! According to a study out of Australia's Edith Cowan University, parents with the most life satisfaction (which means those who are the happiest) are those that have four or more children. Dr.