Samantha Wildman was married to a Ktarian named Greskrendtregk and became pregnant with his child shortly before leaving Deep Space 9. By the time she discovered her pregnancy, Voyager was already in the Delta Quadrant. (VOY: "Elogium") She experienced many difficulties with this pregnancy, her first, including shooting pains in the lower back and the legs. (VOY: "Tattoo")
There were complications during the birth, and the child died. However, a subspace accident had duplicated Voyager and the duplicated child was returned to Samantha when her counterpart was killed. (VOY: "Deadlock") The child was later named Naomi.
After the Kazon captured Voyager and stranded the crew on a primitive planet called Hanon IV, Ensign Wildman's baby became ill and almost died. The chief of a primitive tribe native to the planet cured her with herbs and roots. (VOY: "Basics, Part II")
It was thanks to Ensign Wildman that Chakotay was able to remind Neelix, who had a crisis of faith, that his family was now the crew of Voyager, especially Wildman's daughter Naomi, who was very fond of him indeed and was actually Neelix's god-daughter. (VOY: "Mortal Coil")
In 2374, Ensign Wildman was part of a team headed by Seven of Nine, a group that prepared a harmonic resonance chamber to neutralize omega molecules; Wildman was assigned to bring the power relays online. (VOY: "The Omega Directive")
On an away mission, the Delta Flyer, crewed by Wildman, Tom Paris and Tuvok, was damaged by an ion storm, crashed, and was buried under rock on a deserted planetoid. Wildman was seriously hurt, bleeding internally. With their air running out, Wildman recorded a goodbye message to her daughter. Just before the air was depleted, the Flyer was dug out and transported to Voyager, saving the crew. After her injuries healed, Wildman visited a holoprogram, accompanied by Naomi, Neelix and Captain Janeway. (VOY: "Once Upon a Time")
Background information Edit
Samantha Wildman was played by actress Nancy Hower.
The character of Samantha Wildman was named after a little girl who died in an accident, and whose organs were subsequently donated to the wife of writer Jimmy Diggs.  The girl's parents told Diggs that she liked animals, so Diggs made Wildman a xenobiologist. (Star Trek Encyclopedia (3rd ed., p. 561))
Chronologically, Ensign Wildman does not appear again after the events of "Once Upon a Time". She does appear in the later-produced episode "Fury", though only in footage that is actually set earlier than "Once Upon a Time", in 2371. However, Wildman is also mentioned in various episodes that not only were produced after "Once Upon a Time" but are also set after that installment, where she is referred to as still being alive and well.
Star Trek: Starship Creator gives her parents' names as Linette and James Wildman, and a sister named Nancy Wildman. Samantha was born in 2347 on Ekaris III.