Poor Starburst. She did not get too many of the big pone gene.  
She did the the royal wing gene though.
 
Finally watched the ending of season 9. And oh boy what an ending it was. Immediately got inspired to do something and make a silly comic about how Twilights eventual new found height would affect her personal life.
 
The sparkle family is a family of some pretty huge characters. And it won’t be easy raising the embodiment of darkness (Nyx) when she towers over you.
 
And although Nyx is a model daughter. She couldn’t help but to sometimes tease her mother about how being large is all it takes. (The Cmc would be proud.)
 
That teasing would be repaid, as Twilights continuous growth towards Celestia-teir height eventually helped her take back the mantle of Large and in charge.
 
Not everyone shares the Alicorn gene of size however. And Starburst found that even adolescence could not save her from being at eye-to-chest level with most of her family.
 
Starburst is by Kianamai(formerly Kilalaaa)
 
Nyx is by Pen stroke.