śrī-śuka uvāca
ekadā gṛha-dāsīṣu
yaśodā nanda-gehinī
karmāntara-niyuktāsu
nirmamantha svayaṁ dadhi

yāni yānīha gītāni
tad-bāla-caritāni ca
dadhi-nirmanthane kāle
smarantī tāny agāyata

Śrī Śukadeva Gosvāmī continued: One day when mother Yaśodā saw that all the maidservants were engaged in other household affairs, she personally began to churn the yogurt. While churning, she remembered the childish activities of Kṛṣṇa, and in her own way she composed songs and enjoyed singing to herself about all those activities.

[Srimad Bhagavatam - 10.9.1-2]