Pandu and his wives began leading their lives in a forest. He met a few sages, and asked them a way to attain heaven. But the sages replied that, without children, one can never go to heaven.
Distressed, Pandu shared his plight with Kunti. She revealed to Pandu, that she had a boon of begetting a child from any God she desires. Pandu was ecstatic and suggested that he could get virtuous children through her boon.
Kunti used this mantra, and invoked Lord Yama-Dharma, who blessed them with a son, who was wise and always followed dharma, named Yudhisthira.
Meanwhile, in Hastinapur, Gandhari was also pregnant, but her pregnancy was unusual.
She remained pregnant for 2 years, while Kunti, prayed to Vayu Deva and gave birth to a boy, who was strong as the wind, named Bhima.