SB 1.11.29
tah putram ankam aropya
sneha-snuta-payodharah
harsa-vihvalitatmanah
sisicur netrajair jalaih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The mothers, after embracing their son, sat Him on their laps. Due to pure affection, milk sprang from their breasts. They were overwhelmed with delight, and the tears from their eyes wetted the Lord.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When Lord Krsna was at Vrndavana even the cows would become moistened by affection towards Him, and He would draw milk from the nipples of every affectionate living being, so what to speak of the stepmothers who were already as good as His own mother.