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The inexact science of raising kids

Laura Sanders

Growth Curve


Growth Curve

Evidence is lacking that ‘cocooning’ prevents whooping cough in newborns

family visiting newborn baby

THE HERD The cocooning strategy, in which people who will be in contact with a newborn all receive vaccinations to protect the vulnerable baby, may not be that protective after all. Better protection against whooping cough comes from vaccinating a mother during pregnancy, scientists say.

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Last week, I wrote about how powerfully protective whooping cough vaccines can be when babies receive their first dose before even being born, from their pregnant mothers-to-be. As I was looking through that study, another of its findings struck me: Babies didn’t seem to get any extra whooping cough protection when their moms were vaccinated after giving birth.

I wondered if this meant that I was unreasonable when I insisted my parents be fully boosted before visiting their first granddaughter. If post-birth vaccinations aren’t that important for mothers, who are entwined in every way imaginable with their newborns, is it likely that grandparents’ vaccination status is all that important?

The practice of making sure people who come into contact with a vulnerable newborn are up on their shots is called “cocooning.” The idea is based on straight-ahead logic: By eliminating dangerous germs from those people, the newborn is protected. She can’t catch what isn’t there.

While it’s a good idea to make sure everyone is current on vaccines, the evidence for cocooning as a way to keep infants healthy has been lacking. “I haven’t seen any studies that show a strong protective effect form the cocooning strategy,” says Nicola Klein, the pediatrician and vaccine researcher who led the recent Pediatrics study on vaccinations for whooping cough.

Some of the evidence that questions the cocooning strategy comes from a study of Australian babies. In 2009, cases of whooping cough began to increase in Western Australia. In 2011 and 2012, health officials there offered free vaccines to new parents, grandparents and others who had close contact with newborns. It was a good idea, but it didn’t seem to work, researchers reported in 2015 in Vaccine. Whooping cough rates were similar between babies whose parents had been vaccinated in the 28 days after their children were born and babies whose parents were not vaccinated.

That’s just one study, and it has its limitations. The researchers couldn’t trace the route of infections in these infants; infections could have come from older siblings or even people who were vaccinated but still carried the germs. And the data were gathered from birth and vaccination records, which may not have been perfect. But overall, the study didn’t reveal big benefits for babies whose families practiced the cocooning strategy.

Even if post-birth vaccinations don’t protect babies that well, vaccinating parents, grandparents and other people who snuggle babies is “certainly not a harmful thing or a bad thing,” Klein points out. Anything that may curb the spread of whooping cough is actually a very, very good thing, both for the person getting vaccinated and all of us in the herd.

Still, it seems that the cocoon strategy pales in comparison to the protection offered by vaccination during pregnancy, an approach that the Centers for Disease Control and Prevention recommends. When mothers get vaccinated during pregnancy, protective antibodies zip through the placenta straight into the baby. “It’s not just the indirect effect of protecting the mom, so it’s therefore protecting the baby,” says Klein, of the Kaiser Permanente Vaccine Study Center in Oakland, Calif. “This is actually directly giving an immune response to the baby when you vaccinate during pregnancy.”

Human Development,, Health

Vaccinating pregnant women protects newborns from whooping cough

By Laura Sanders 9:00am, April 12, 2017
Pregnant women who receive the pertussis, or whooping cough, vaccine pass on to their new-borns immunity to the potentially deadly bacterial infection.
Human Development,, Health

Language heard, but never spoken, by young babies bestows a hidden benefit

By Laura Sanders 2:00pm, April 5, 2017
Adults who as babies heard but never spoke Korean benefited from their latent language knowledge decades later, a new study finds.
Human Development,, Health

For kids, daily juice probably won’t pack on the pounds

By Laura Sanders 7:00am, March 30, 2017
An analysis of existing studies suggests that regular juice drinking isn’t linked to much weight gain in kids.
Health,, Human Development

Don’t put greasy Q-tips up your kid’s nose, and other nosebleed advice

By Laura Sanders 7:00am, March 28, 2017
Nosebleeds in children are common and usually nothing to fret about.
Human Development,, Health

Touches early in life may make a big impact on newborn babies’ brains

By Laura Sanders 12:30pm, March 22, 2017
The type and amount of touches a newborn baby gets in the first days of life may shape later responses to touch perception, a study suggests.
Human Development,, Health

See how bacterial blood infections in young kids plummeted after vaccines

By Laura Sanders 3:39pm, March 15, 2017
Rates of pneumococcal bacteremia in children plummeted by 95 percent after the introduction of vaccines against Streptococcus bacteria.
Human Development,, Health

Anesthesia for youngsters is a tricky calculation

By Laura Sanders 9:00am, March 6, 2017
Scientists, doctors and parents face uncertainty when it comes to anesthesia for babies.
Human Development,, Health

A preschooler’s bubbly personality may rub off on friends

By Laura Sanders 8:00am, February 23, 2017
Scientists caught personality shifts in preschoolers over a year by observing play.
Human Development,, Health

Birth may not be a major microbe delivery event for babies

By Laura Sanders 12:13pm, February 15, 2017
A study of mother-baby duos suggests that birth itself may not be the main event for getting microbes in and on babies.
Human Development,, Health

Little jet-setters get jet lag too

By Laura Sanders 1:00pm, February 6, 2017
Help young children fight jet lag with a few simple steps.
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