'I'm 41, shh don't tell anyone,' Kate quietly revealed to the youngsters, who had moments earlier welcomed the delighted royal with a showering of hugs.

Source: https://www.dailymail.co.uk/femail/article-12799549/kate-middleton-proves-omid-scobie-wrong-stepford-wife-end-game.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

White noise sounds like a "shh" sound in the form of radio static or the hum of an air conditioner.

Source: https://www.salon.com/2023/07/23/wait-is-noise-harmful-for-sleep-now-how-these-bland-vibes-can-be-for-baby--and-you/