Products with konjac don’t have any contra indications: the only indication is that it is preferable that children do not consume more than 2x 1gr per day, as it is a fiber that is very active in the intestine. And the general rule of good sense is, to limit the amount of product eaten on a daily basis and, especially when the product has not yet been tried, introduce it in small amounts. Like any new food! The other important rule is to drink enough, children often drink not much water: make sure that they drink when they eat foods with konjac inside!