In the wombs of his two wives. Yudhishthira was the son of the eldest. Yudhishthira was born of Dharma, Vrikodara Bhima was born of Maruta;
द्वयोः स्त्रियोर्गुणज्येष्ठस्तेषामासीधुधिष्ठिरः। धर्माधुधिष्ठिरो जज्ञे मारुताच्च वृकोदरः॥