SB 3.19.23
tada diteh samabhavat
sahasa hrdi vepathuh
smarantya bhartur adesam
stanac casrk prasusruve
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
At that very moment, a shudder suddenly ran through the heart of Diti, the mother of Hiranyaksa. She recalled the words of her husband, Kasyapa, and blood flowed from her breasts.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
At Hiranyaksa’s last moment, his mother, Diti, remembered what her husband had said. Although her sons would be demons, they would have the advantage of being killed by the Personality of Godhead Himself. She remembered this incident by the grace of the Lord, and her breasts flowed blood instead of milk. In many instances we find that when a mother is moved by affection for her sons, milk flows from her breasts. In the case of the demon’s mother, the blood could not transform into milk, but it flowed down her breasts as it was. Blood transforms into milk. To drink milk is auspicious, but to drink blood is inauspicious, although they are one and the same thing. This formula is applicable in the case of cow’s milk also.