In the 7 years of being stranded only 2 children were born on Voyager to the crew, Naomi and Tom & B'Elanna's daughter.
Should there have been more effort to show that other members of the crew had begun to pair off and start family's? As far as we know only B'Elanna and Tom got married in the 7 years and no other relationship got any further than dates.
Was this just another case of the writers not really focusing on the realities of the situation? They would mention about having to become a generational ship but never actually show it happening.