They're good for everyone.
From The Telegraph:
So, with the help of Swedish researcher Therese Wallin, I set about pulling
together data that put a different cost/benefit complexion on the “shall we
have another?” conversation.
Some of the most startling literature comes from medical research. It has long
been known that siblings – by sharing germs at a young age and mutually
priming immune systems – provide some protection against atopic conditions
such as hay fever and eczema. But the latest breakthroughs suggest growing
up with a brother or sister can also guard against food allergies, multiple
sclerosis and some cancers. For reasons that have yet to be fully fathomed,
these benefits do not apply to children simply by dint of spending time
sharing bugs with other youngsters – as they would, for instance, in day
care.
The other “epidemics” of modern childhood, obesity and depression, are also
potentially reduced by exposure to siblings. A clutch of major studies from
all over the world shows that the more siblings a child has, the thinner
they will be. Put simply, siblings help children burn off fat. One American
study honed its analysis down to an amazingly precise deduction: with each
extra brother or sister, a child will be, on average, 14 per cent less
obese. Reductio ad absurdum? We can scoff at such a definitive conclusion,
until we realise that no one in medical academia has suggested that having a
sibling ever made anyone fatter.
None of this is rocket science. When we compare like with like, regardless of
family background, children with siblings tend to enjoy better mental
health. Obviously, again, this is to generalise massively. The world is full
of jolly singletons. But dig into some of the big data sets out there and
unignorable patterns emerge. On experiences on which nation states hold a
big corpus of statistics, events such as divorce and death, for example,
strong correlations exist.
Cause is not always correlation, but it stands to reason that when parents
split up or die, a child will benefit from having a sibling to turn to.That
solidarity runs throughout the lifespan. After all, a sibling is for life,
not just for childhood....
And what of my own children? How do they feel, providing the material for a
sibling laboratory? The eldest, just 14, has already announced that, should
she have children, their numbers will be limited.
My wife and I started out similarly sceptical about fecundity. But, having
struggled to have a second child, it was hard to shake the mindset that a
pregnancy was anything other than a blessing. As our family expanded,
necessitating bigger cars and fewer holidays, we took to heart the views
attributed to Elizabeth Longford, the historian and Roman Catholic
mother-of-eight. Asked why so many, she said that since her children were so
different, curiosity drove her to find the limits of genetic diversity.
We find that a big family has unleashed the inner anthropologist in us, too.
Some friends flinch at the managed chaos of our home, but my wife and I love
the abundance of human interaction. We are the directors of our own daily
soap opera. (Read more.)
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