That would genetically remove altruists from the population (assuming altuism is heritable and assuming children also have to press button). The world would be

That would genetically remove altruists from the population (assuming altuism is heritable and assuming children also have to press button). The world would be a more selfish place in a generation after the experiment. Presumably parents press the button for their babies. As a family you would have to agree to all push the same colour otherwise you run the risk of only some of you dying. As a group decision I would think everyone would agree on red as the safe bet. Also making altruistic choices for children has two edges - and many parents would put their children's interests first not some strangers.