Prabhupada:

When Krsna was playing as a child, He ate earth and the playmates complained to mother Yasoda: "Mother, your son Krsna is eating earth." Mother Yasoda called for explanation: "Krsna, why You are eating earth? I have given You sandesa." Krsna said, "No, mother, I have not eaten." "No, Your friends are complaining." "No, they have become My enemies this morning. We had some quarrel. Therefore they have combined together to make Me chastised by you." So in this way... Then mother Yasoda wanted to solve this problem: "All right, show Your mouth, open Your mouth. I want to see." And when Krsna opened the mouth, the mother saw innumerable universes are within the mouth. This is Krsna. Anor aniyan mahato mahiyan. Krsna enters within the universe, but at the same time, millions of universes are within His mouth. This is the explanation of "the greater than the greatest and the smaller than the smallest." Of course, mother Yasoda, although she saw, she could not believe it because mother Yasoda never thought of that Krsna is the Supreme Personality of Godhead. She always thought that "He is my teeny child." That's all. "I have to take care of Him." This is called paternal feelings. Vatsalya-rasa."