Mother Yasoda challenged Krsna, "If You have not eaten earth, then open Your mouth wide." When challenged by His mother in this way, Krsna, the son of Nanda Maharaja and Yasoda, to exhibit pastimes like a human child, opened His mouth - SB 10.8.36

Expressions researched:
"Mother Yaśodā challenged Kṛṣṇa" |"If You have not eaten earth, then open Your mouth wide" |"When challenged by His mother in this way, Kṛṣṇa, the son of Nanda Mahārāja and Yaśodā, to exhibit pastimes like a human child, opened His mouth"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

When challenged by His mother in this way, Kṛṣṇa, the son of Nanda Mahārāja and Yaśodā, to exhibit pastimes like a human child, opened His mouth.

SB 10.8.36, Translation and Purport

Mother Yaśodā challenged Kṛṣṇa, "If You have not eaten earth, then open Your mouth wide." When challenged by His mother in this way, Kṛṣṇa, the son of Nanda Mahārāja and Yaśodā, to exhibit pastimes like a human child, opened His mouth. Although the Supreme Personality of Godhead, Kṛṣṇa, who is full of all opulences, did not disturb His mother's parental affection, His opulence was automatically displayed, for Kṛṣṇa's opulence is never lost at any stage, but is manifest at the proper time.

Without disturbing the ecstasy of His mother's affection, Kṛṣṇa opened His mouth and displayed His own natural opulences. When a person is given varieties of food, there may be a hundred and one varieties, but if one likes ordinary śāka, spinach, he prefers to eat that. Similarly, although Kṛṣṇa was full of opulences, now, by the order of mother Yaśodā, He opened wide His mouth like a human child and did not neglect the transcendental humor of maternal affection.