CC Antya 7.34
śreya evaṁ mahodayam
yaśodā vā mahā-bhāgā
papau yasyāḥ stanaṁ hariḥ
nandaḥ — Nanda Mahārāja; kim — what; akarot — has performed; brahman — O brāhmaṇa; śreyaḥ — auspicious activities; evam — thus; mahā-udayam — rising to such an exalted position as the father of Kṛṣṇa; yaśodā — mother Yaśodā; vā — or; mahā-bhāgā — most fortunate; papau — drank; yasyāḥ — of whom; stanam — the breasts; hariḥ — the Supreme Personality of Godhead.
“ ‘O brāhmaṇa, what pious activities did Nanda Mahārāja perform to receive the Supreme Personality of Godhead Kṛṣṇa as his son? And what pious activities did mother Yaśodā perform that made the Absolute Supreme Personality of Godhead Kṛṣṇa call her “Mother” and suck her breasts?’
This verse is from Śrīmad-Bhāgavatam (10.8.46).