Problems are something everyone in Equestria has to deal with, big or small. Some problems have obvious answers, some don't. And sometimes, a pony chooses to deal with their problems on their own, no matter how much help they really want.
(Inspired by and loosely based on "Baby Growth" by Solar-Slash on Deviant Art. Warning: Involves ponies being flushed down a toilet! Takes place in an AU during "Baby Cakes".) Pinkie Pie decides to potty train the Cake Twins, but they get flushed.