All "true" bugs hatch as from their egg as a miniature version of the adult bug.
Range in size from very small (1 mm) to very large (15 cm or 6 inches).
Bug Bites & Treatment
There are several bugs that can cause bites. The treatment will depend on the species. As soon as possible, aim to reduce the potential for severe itching by treating the bite areas. Clean the bite area with rubbing alcohol, alcohol wipes, or plain water.