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Flat head syndrome is caused by a baby remaining in the same position for too long. It can often be corrected by having the baby wear a specialty fitted helmet for up to 23 hours day for four to six months. The condition affects one in four babies, according to Edith Bracho-Sanchez, a board-certified pediatrician and Global Health Fellow at Stanford.

GUYS pic.twitter.com/V5dzkmVCGu

— christine teigen (@chrissyteigen) December 3, 2018

\"Incidents [of flat head syndrome] have gone up since we said 'back to sleep,' which we absolutely have to do,\" Bracho-Sanchez told \"GMA,\" referring to the recommendation that babies sleep on their backs to reduce the risk of sudden infant death syndrome.

Bracho-Sanchez said that changing your baby's position in the crib, but still keeping them on their back, is very effective in preventing and treating the plagiocephaly.

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A post shared by chrissy teigen (@chrissyteigen) on Jan 26, 2019 at 4:16pm PST

The same goes for infants that spend time in a swing or rocker.

\"Anything you can do to have them look both ways because their little bones are still so malleable,\" she explained.

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A post shared by chrissy teigen (@chrissyteigen) on Mar 9, 2019 at 12:27pm PST

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A post shared by chrissy teigen (@chrissyteigen) on Feb 15, 2019 at 8:32am PST

The American Academy of Pediatrics said parents should first try physical therapy to see if a head shape problem will correct without needing a helmet.

After Teigen shared the initial photo of Miles in his helmet, moms and dads began sharing pics of their own little ones wearing their helmets. Teigen's latest post sparked a new thread of babies in helmets with parents captioning that they \"can't wait for graduation.\"

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