Nezha, 哪吒(Nézhā) is a famous figure in classic Chinese legends. According to Wikipedia,
According to Fengshen Yanyi, Nezha was born during the Shang Dynasty in a military fortress at Chentang Pass. His father was a military commander named Li Jing, who later became the “Pagoda-wielding Heavenly King”. Nezha’s mother, Lady Yin, gave birth to a ball of flesh after being pregnant with him for three years and six months. Li Jing thought that his wife had given birth to a demon and attacked the ball with his sword. The ball split open and Nezha jumped out as a boy instead of an infant. Nezha could speak and walk immediately after birth. He was later accepted by the immortal Taiyi Zhenren as a student.
If you want to know more about Nezha and his stories, this animation could satisfy your curiosity. This animation was made in 1979 and was a really masterpiece. Enjoy it.