When the baby was born, she was half-Cardassian. Dukat proclaimed that the child was transformed by the Pah-wraiths into a symbol of his covenant with his followers in an attempt to hide the fact that Dukat himself was the father. (DS9: "Covenant")
Initially, the producers wanted the baby to be fairly visible during Dukat's proclamation of a miracle, but the problem was that there are very strict rules as to how much prosthetic makeup can be used on an infant, and how long an infant can be on-set. As such, the producers decided to go with an animatronic baby, and they hired the people who made the Chucky doll for the 1988Tom Holland film Child's Play. However, according to B.C. Cameron, "It looked like Chucky with a Bajoran nose. His eyes were blinking and he was really spooky looking." Ira Behr said that the first shoot of the scene where Dukat holds the baby up for the gathered crowd produced the biggest laugh ever seen in dailies; "This animatronic baby was moving its head, and Marc was holding it up for the camera, playing the scene for all it's worth, even though it looked ludicrous. It looked as if he were proclaiming to the world, 'Take a look! This is a phony baby! You can get one at Toys "R" Us! Thirty-five dollars and ninety-five cents!' We were howling with laughter and crying in frustration at the same time. The day will live in infamy." Needless to say, the scene was reshot sans animatronic baby. (Star Trek: Deep Space Nine Companion(citation needed • edit))
Seska became pregnant with Culluh's child, but she believed that it was Chakotay's, having extracted his DNA during his captivity and apparently impregnating herself with it. She later told Culluh that Chakotay had raped her during his captivity. (VOY: "Alliances")
Seska gave birth to her child in late 2372 and used him in a ruse to lure Voyager into a trap, claiming that Culluh had taken the child to be raised as a slave. This plot proved initially successful. Voyager was captured, and the crew – save for The Doctor, Lon Suder, and Tom Paris – was stranded on Hanon IV.
During the Kazon control of Voyager, Seska had The Doctor examine the child to confirm his health. The Doctor confirmed that the child had Kazon rather than Human DNA, despite his Human appearance. He speculated that he would show more Kazon traits as he got older, although the unique circumstances of his heritage made this unknown.
Culluh's control of Voyager did not last long; Paris managed to lead the Talaxians in an attack on Voyager after contacting The Doctor and Suder to disable Voyager's backup phaser couplings while he disabled the primary ones. The subsequent damage left Voyager essentially dead in the water, Seska being one of the casualties in the attack. With the ship now virtually useless to him, Culluh fled, taking the child with him. (VOY: "Basics, Part I", "Basics, Part II")
In Star Trek Online, Seska's child is now fully grown and named Sessen (β), has taken over his father's role as First maje of the Kazon-Nistrim. He carries on his parents' vendetta against Starfleet and blames them for his mother's death.
In the final draft script of "E²", this boy was described as having "Denobulan and Human features."
David Moore received no credit for this appearance but was nevertheless delighted to appear in the part. His father recalled, "He wanted to be an alien really badly [...] Since David was very easy to work with, they put him in 'E²' as a half-Denobulan with a forehead and some major face time. He was thrilled, and his mom was beaming. I got to put his hair on for him." (Star Trek: Communicator issue 152, p. 31)