Silkworm shit has a very good effect of expelling dampness and resolving phlegm.

Silkworm shit is no longer taught to shit, called silkworm sand.

The pillow made of silkworm sand also has the effect of cooling and fire reduction, it has strong sweat absorption, good ventilation, warm in winter and cool in summer. Infants and young children sleep in all seasons, can correct the head shape, absorb sweat, anti-spitting. Toddlers can prevent rashes, while promoting brain development molding.

Expanded

Silkworm is a metamorphosis of insects, the most common is the mulberry silkworm, also known as the house silkworm, mulberry leaves for food, spitting cocoon of one of the economic insects. Mulberry silkworm originated in China, its development temperature is 7 ~ 40 ℃, feeding temperature for 20 ~ 30 ℃.

The baby silkworm feeds on mulberry leaves, and its body becomes white after eating mulberry leaves continuously, and it starts to shed its skin after a period of time. When it is shedding its skin, it will not eat or move for about a day like sleeping, which is called "dormancy". After shedding its skin once, it becomes a second instar larva. It shed skin once even if the increase of one year, larvae *** to shed skin four times, become five larvae, and then eat mulberry leaves for eight days to become mature silkworms, began to spit silk cocoons.

Reference? Baidu Encyclopedia - Silkworm