How can one tell that a silkworm has out grown?

A silkworm can be identified as having outgrown its current stage by observing its size and physical changes. As they mature, silkworms shed their skin multiple times, and after each molt, they become noticeably larger. Additionally, when they are ready to pupate, they may display behaviors such as increased restlessness and reduced feeding. The final instar stage before cocooning is characterized by a significant increase in size and a change in coloration.