Five couples from very different backgrounds and lifestyles bring babies into the world and discover unexpected and surprising things about themselves and their partners.
The first two weeks at home throw routines and relationships into turmoil as the first-time parents cope with explosions of breast milk and bodily fluids.
Life after birth gets serious as sleep deprivation sets in and some baby health issues put more pressure on relationships.
As the new parents begin to spread their wings, they find unfamiliar challenges bring more laughter, tears and tantrums.
While the mums get some 'me-time', the dads step up to the babysitting plate - but it's the bubs who get the last laugh.
After four months, the parents are finding their feet as relationships settle into the new order.