Who was kunti's first child?

Karna was Kunti's first child, born through her invocation of Surya (the sun god) before she married Pandu. Kunti had received a boon from Durvasa rishi that allowed her to invoke any deity and bear a child. She tested this boon and had Karna, but fearing social stigma as an unwed mother, she abandoned him in a basket on the river. He was later found and raised by Adhiratha and Radha, a charioteer couple.