They might seem like a harmless, nostalgic summer treat, but a little-known ingredient in some frozen slushies can pose a serious health risk for some kids. In a new study, experts review 21 cases of children who became unwell after consuming these products and ask whether the time is right to update public health guidance,

What are the dangers in slushies for kids that parents should watch out for? What if this fun treat isn’t as safe as it seems? Recent news from doctors and researchers has parents and experts talking—and it’s all about something hiding in those slushies that might be making kids sick.