Second Origin (2015)

Second Origin is a Spanish film that's not so much about the end of the human race at the hands of mass destruction as it is the rebuilding of it. Alba (Rachel Hurd-Wood) and Didac are young, and they're the only people left to repopulate the planet - or at least, so they think. Free of judgement or societal rules, they lives their lives differently and more freely, though of course with much greater risk. Luckily we get to see a little of that repopulation when the pair does some baby making and Alba breastfeeds her newborn, showing off her spectacular rack! If this is the end of the world, it's not a bad way to go.