The correct term for a baby porcupine is a porcupette. A porcupette has soft quills made of hardened hair. This protects the mother from injury as she gives birth.
After only a few days, the porcupette's quills are coated with a substance called keratin, which hardens and creates the sharp quills porcupines are famous for. Some porcupine quills can be up to 20 inches long. These long quills form a skirt around the body of the porcupine. The porcupine raises the sharp, needle-like quills if danger is near. The New World porcupine's quills have barbs at the end that resemble fish hooks. This causes the quills to stick into the flesh of predators.