BTW, WIC (in NJ) gives yogurt, but they only allow low fat or fat-free. The kosher fat-free one has 40 grams of sugar in an 8 oz serving. That means 8 teaspoons of sugar in a cup.
Imagine putting 8 spoons of sugar into a coffee? But that's what WIC wants us to feed our children, because after all, it's fat-free.
Yogurt is different from cereal because it contains a natural sugar, lactose, just like milk does. To see how much sugar is added to the sweetened yogurt, you have to subtract the lactose from the total sugar. For example, Mehadrin 7 oz containers.
http://www.mehadrin.com/productdetail/natural-low-fatPlain yogurt has 14 g sugars, and since there's no sugar in the ingredients, this is all lactose.
Strawberry yogurt has 31 g sugars, so subtracting 14 g for lactose gives about 17 g added sugar, or about 4 teaspoons in all that gooey syrup or jam or whatever it is.
This sort of confusion led the FDA to change the labels on food, so that now they're supposed to specify ADDED sugar rather than just total sugars, but small companies were given more time to re-do the labels, so it might take a while to see it on the kosher yogurts.
https://www.fda.gov/food/new-nutrition-facts-label/added-sugars-new-nutrition-facts-label