The cows had given birth to new calves, but while coming down from Govardhana Hill, the cows, because of increased affection for the older calves (Krsna's calf expansions), allowed the older calves to drink milk from their milk bags - SB 10.13.31

Expressions researched:
"The cows had given birth to new calves, but while coming down from Govardhana Hill, the cows, because of increased affection for the older calves, allowed the older calves to drink milk from their milk bags"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

The cows had given birth to new calves, but while coming down from Govardhana Hill, the cows, because of increased affection for the older calves, allowed the older calves to drink milk from their milk bags and then began licking the calves' bodies in anxiety, as if wanting to swallow them.

SB 10.13.31, Translation

The cows had given birth to new calves, but while coming down from Govardhana Hill, the cows, because of increased affection for the older calves, allowed the older calves to drink milk from their milk bags and then began licking the calves' bodies in anxiety, as if wanting to swallow them.