The baby Cakes are freakin' adorable, but I find it completely unfair that Pound could fly and Pumpkin could use magic at one month old, and at that the same time, Scootaloo and Sweetie Belle couldn't when all members of the CMC are definitely between five and ten years old.
same way two brunettes have a blonde haired baby.. genetics... like me, i ONLY have blonde hair cause its so strong on my dads side and my moms dad was blonde. so its just genetics. and genes tend to repeat somewhere in the line..
Simple, Mr. Cake's great-great-great-great grandfather was a unicorn and Mrs. Cake's great aunt's second cousin twice removed was a unicorn. Straight from the episode these foals debuted. That makes sense, right?