The Seattle Seahawks return to the Super Bowl Sunday, 12 years after their last and only Super Bowl win. The team’s fan base, nicknamed “The 12s” have a long, loud tradition that dates back to the 80s. The No. 12 jersey has been retired since 1984 to honor the crowd’s spirit and volume.

The number 12, and the Seahawks’ Super Bowl win in 2014 was an important day for Mayan Bomsztyk. She was about to have her first baby that day at Swedish Hospital in Seattle.

“My labor was taking forever,” Bomsztyk said. The nurses at the hospital made a special onesie that would be awarded to the 12th baby born on that Super Bowl Sunday.