He was taking butter from a pot which was hanging from the ceiling on a swing, and He was feeding it to the monkeys. She saw Kṛṣṇa looking this way and that way in fear of her because He was conscious of His naughty behavior. After seeing her son so engaged, she very silently approached Him from behind.
Kṛṣṇa book, Chapter 9 - Mother Yaśodā Binding Lord Kṛṣṇa (Excerpt)
