After the birth of Cadance's fourth child, an adorable little pegasus filly, Princess Flurry Heart wants to know why none of her other brothers and sisters were born as alicorns. Her parents claim not to know why she's different. They're lying
Princess Cadance wakes up to care for Flurry Heart in the middle of the night, but notices something. She's growing. This makes her realize her little baby isn't going to stay little for very long, and thinks ahead to all of the wonderful things yet
Twilight and Family find themselves in a pinch. They need a babysitter so they can make it to a concert. Chrysalis wants revenge, and launches a surprise attack. Instead of wasting time, they make a wager on if Chrysalis can last as a foal sitter.