tāṁ gṛhītvā caraṇayor
jāta-mātrāṁ svasuḥ sutām
tām—the child; gṛhītvā—taking by force; caraṇayoḥ—by the two legs; jāta-mātrām—the newborn child; svasuḥ—of his sister; sutām—the daughter; apothayat—smashed; śilā-pṛṣṭhe—on the surface of a stone; sva-artha-unmūlita—uprooted because of intense selfishness; sauhṛdaḥ—all friendship or family relationships.
Having uprooted all relationships with his sister because of intense selfishness, Kaṁsa, who was sitting on his knees, grasped the newborn child by the legs and tried to dash her against the surface of a stone.
Link to this page: https://prabhupadabooks.com/sb/10/4/8