Overview: In the final episode, the parents hit their stride but discover an important truth - once you have children you never stop worrying! Some of those worries - like vaccinations - are common to all of the families, while other mums and dads have their own particular fears which keep them awake at night. For Tristan and Katie, it's the news that one of their twins, baby Louis, has Down's Syndrome, but they are determined to make sure he has just the same fulfilling life as his little sister Roxie.