Marshall and Lily think about having a baby and have to decide if they are ready for it. Whereas Marshall is excited about the idea but swamped with work at GNB, Lily is unassured and reverts to Ted, Robin and a lot of wine to help with the decision. Meanwhile, Barney creates a new holiday for single guys without kids and inducts us into the theory of the 'cheerleader effect'. While Barney's theories are usually insane, I find this particular one to actually be a real thing.
Some of the jokes may cast a slur at childless single life, but Neil Patrick Harris' performance makes more than up for it. Besides all the fun, it is good to see some Ted and Robin interaction again.