Krishna ate clay

Just like Kṛṣṇa, when He was a boy, one day He was eating clay. His mother asked, "Oh, just open Your mouth. I want to see what You are eating." And Kṛṣṇa showed his mother that millions of planets and millions of skies are within his mouth. So He is the greatest, who can show that "Millions of skies are within Me."

As a boy Kṛṣṇa was eating clay. Some friends complained to mother Yaśodā that, "You gave Him nice foodstuff, and He is eating clay." So mother called Him: "Oh, Kṛṣṇa, You are eating clay?" Kṛṣṇa said, "No, mother. They're all liars." (laughter) "Oh, Your elder brother Balarāma is also saying." "Oh, He is angry upon Me. He is angry upon Me; therefore He is also speaking lie." Then the boys still stressed, "No, mother. He has eaten clay. We have seen." So mother said, "All right. Open Your mouth. I'll see." So Kṛṣṇa opened His mouth, and she saw the whole material cosmic manifestation. Not only Yaśodā, thousands of Yaśodā and thousands of planets, sun, moons, and everything saw. Mother's thought, "Must be something jugglery. All right. Forget. Don't do it again."