Devibhagavatapurana 7.9.55

7.9.55

kārayāmāsuravyagrāstasyeṣṭimindradevatām |
kalaśaḥ sthāpitastatra jalapūrṇastu vāḍavaiḥ ||

Vyâsa said:-- O King! Hearing the words of the King they were all filled with pity; and, with fulness of mind, made him to perform the sacrifice whose presiding deity was Indra. For the sake of the King, that he may get a son born to him, they had a jar filled with water by the Brâhmins and purified and charged that jar with the Vedic Mantrams. The King got thirsty in the night and entered in the sacrificial ground; seeing the Brâhmins asleep, the King himself drank that water, surcharged with the Mantram. The Brâhmins consecrated and kept that water apart, according to due rules, surcharging with Mantrams, for the wife of the King; but the King, getting thirsty, himself drank that water unconsciously. Next morning the Brâhmins seeing the jar of water empty, were startled very much with fear; the Brâhmins then asked the King:-- Who drank the water? When they came to know that the King himself drank the water, the Munis thought this to he an act of Daiva (Fate) and completing the sacrifice returned to their abodes. Then the King became pregnant by the power of the sacrificial Mantrams. After some time, the son became fully developed. Then the King's ministers, cutting his right bowel, got the son out. Out of the God's favour, the King did not die. When the ministers were troubled with the thought whose milk the child will suck, then Indra spoke out the child would drink (Mân-Dhâtâ) my forefinger and gave his finger into the child's mouth. For that reason his name was Mândhâtâ. Thus I have described in detail the origin of Mândhâtâ.
Here ends the Ninth Chapter of the Seventh Book on the story of Kakutstha and the origin of Mândhâtâ in S'rî Mad Devî Bhâgavatam the Mahâ Purânam, of 18,000 verses, by Maharsi Veda Vyâsa.