Katniss and Peeta Mellark's son

The boy is the second child of Katniss Everdeen and Peeta Mellark. His sister is referred to as "the girl". Their first names are not stated.

Biography
Katniss' pregnancy with "the boy" was easier than hers with her daughter. However, she states, not by much. He has Peeta's blonde hair and Katniss' grey eyes of the Seam. He is a toddler during the epilogue, and seems to be at least two years younger than his sister. The epilogue also states that he has chubby legs. Katniss probably had him around age 35, as eighteen years ago, she was 17, and she started having kids 15 years after that. He does not know of his parents' roles in the Games, but Katniss knows that he will learn as he matures. He is mentioned in the epilogue of Mockingjay, chasing after his sister in the meadow on chubby toddler legs.