Are childless couples selfish?

I have read that people who don't want children are inherently selfish. Either way it's a choice that people make as bringing up children is indeed very hard ! People make sacrifices to put their children first in mostly any decision. This is understandable but can also be considered a selfish choice as the childless person is free to do what they want without having to consider others, it maybe because the person is career minded or just not maternal or paternal. What do you think ?