As the omicron coronavirus variant continues to spread across the United States at a staggering rate, parents may be wondering if their children’s cloth masks are the right face coverings for them.

The TikTok video shows a blond child wearing a white face mask. To her left, an orange device takes readings. "1,376. 1,536. 1,769," a voice says in the clip. "2,125. So remember: Anything over 2,000 ...