The world is happy to see your little one, even if they’re happy they’re not happy, a new study says.
Happy Earth Day, which celebrates the birthday of the planet, is celebrated on the fourth Wednesday of every month.
This year, it’s on May 21.
Researchers at the University of Illinois at Urbana-Champaign found that babies born to mothers with happy birthdays were bigger, happier and had better-developed immune systems than babies born on any other day of the year.
They were also healthier, according to a press release from the university.
“The study found that happy birthday mothers were happier, were more satisfied with their lives and had healthier immune systems compared to those with any other birthdays,” the release read.
“The researchers suggest that the positive impact of happy birthdate on immune system development may be due to the stress and stress hormones associated with stress and trauma.”
Researchers also found that the children of happy birthday mothers had more positive emotions than those of happy earth birthdays.
“Babies born to parents who celebrated a happy birth day had more favorable emotions than babies who celebrated any other birthday, but this effect was reversed for happy earth birthday parents,” the researchers wrote.