Silkworm babies will look listless when they are sick, and their whole body color will not be as bright as when they are healthy. Specifically, it is thin, with yellow skin and wrinkles. They basically don't eat mulberry leaves or food. In fact, there are many reasons that need to be treated specifically. Some silkworm babies get sick because the food they feed is not hygienic enough. For example, the mulberry leaves they feed are not clean enough, and some silkworm babies will not eat them because there is too much water on the mulberry leaves, resulting in a sick look. This situation needs to be treated differently, but if it is serious, you need to consult experts in this field for special diagnosis.