From the epics · 2 tellings · North India, Pan-India
The child born still
Abhimanyu falls inside Drona's wheel array; Subhadra mourns him and Krishna comforts her. When Uttara's son is born dead from Ashvatthama's weapon, Subhadra bows her head to Krishna and asks him to keep his vow, and he revives the child by an act of truth. The Bhagavata has Krishna shield the child in the womb, and the child spend his life searching for the one he saw.
Mahabharata, Drona 33 and 78, Ashvamedhika 66 to 70, Mahaprasthanika 1 (Ganguli)
North India · Kurukshetra and HastinapuraAll traditions
Asked to break Drona's array, Abhimanyu says his father taught him to enter it but he cannot come out if danger comes; Yudhishthira and Bhima promise to follow, and he swears by his mother's name. Cut off inside, he is killed. That night Subhadra, hearing Krishna, laments: his lotus face in the dust, the bare earth for his bed, Uttara like a cow without her calf, and she prays that he reach every good end. Krishna tells her not to grieve; Draupadi and Uttara come and the three weep until they faint, and Krishna revives his sister. After the war Uttara's son is born motionless, struck by Ashvatthama's weapon. Kunti pleads first; then Subhadra says the weapon is still in her like an unpulled blade, reminds Krishna of his vow, bows her head and asks that Abhimanyu's son live. Krishna says 'So be it', enters the birth room, withdraws the weapon and swears by his truthfulness, his courage and his friendship with Arjuna; the child moves and is named Parikshit, born when the line had all but ended. At the end Yudhishthira gives Subhadra charge of Vajra, Krishna's great-grandson.
As Krishna mounts his chariot for Dwaraka, Uttara runs to him begging him to let the weapon burn her but spare her child. Krishna sees it is Ashvatthama's Brahma weapon aimed at the last of the Pandava line, takes up his discus and covers the embryo with his own power. In the womb the child, burning, sees a thumb-sized lord, dark, in lightning-yellow cloth with a gold helmet and four arms, whirling a club like a shooting star, who dries the heat as the sun dries dew and vanishes. The child is born safely and is called Parikshit, the examiner, because all his life he will search everyone for the one he saw.
Sources: Mahabharata, Drona Parva, section 33, tr. K. M. Ganguli; Mahabharata, Drona Parva, section 78, tr. K. M. Ganguli; Mahabharata, Ashvamedhika Parva, sections 66 to 70, tr. K. M. Ganguli; Mahabharata, Mahaprasthanika Parva, section 1, tr. K. M. Ganguli; Abhimanyu (Wikipedia); Srimad Bhagavatam 1.8 (Bhaktivedanta Book Trust); Srimad Bhagavatam 1.12 (Bhaktivedanta Book Trust)