Mum's 'nagging' text to husband about car seat likely saved son's life in accident

A US woman named Rebecca Boyer avoided a heartbreaking tragedy thanks to her 'nagging' of her husband.

Earlier this month, the Tennessee mum had just returned to work after having her son, William, leaving her husband David to look after their newborn.

"I demanded that my husband send me hourly updates and recaps on how baby William was handling his first day away from mommy," she wrote on Facebook, apost which had more than 30,000 shares.

After asking how things were going, Ms Boyer received a photo of William in his car seat from her husband which caused her concern when she noticed the baby's position in the car seat needed adjusting.

"My nagging wife reply was to correct William's position in the car seat," she wrote.

"The straps were too loose and the chest clip was way too low. And because I know my husband, I’m sure that he laughed at me and rolled his eyes before tightening the car seat and fixing the chest clip."

And good thing she did, because not long after, the new mum received a "panicked" call from her husband telling her he had just had a car accident.

RELATED: Car seat photo frightening reminder for all parents

"He slammed on the brakes at nearly 50 miles (80 kilometres) an hour before colliding with the front passenger side door of her SUV," she wrote.

"[But] my precious little bundle of joy was so well restrained in his car seat, THAT HE DIDN'T EVEN WAKE UP. Even with the impact of the two cars, William only received a minor jolt - so insignificant that he was able to continue on with his nap, and then spend the next two hours flirting with nurses in the Le Bonheur ED."

While her husband broke his foot in three places, Ms Boyer is glad to use the near miss as a reminder to other parents of the importance of a properly fitted baby car seat.

"I am so thankful that my husband took the extra one minute that was necessary to put William in his car seat safely," she continued.

"I can't even begin to imagine how different the outcome could have been," Boyer added.

"I truly believe that the reason my family is at home sitting on the couch with a pair of crutches instead of down at the hospital is because of my annoying nagging mom voice."