I found another baby I did awhile ago! Jesus how many of these have I already done
 
Shes the daughter of Fluttershy and Discord, and in my head canon, Fluttershy is transgender (dmab transmare), which means she cant give birth herself, but with Discord being the lord of chaos, he had the baby. Being half draconequus, she doesnt have a cutie mark herself, at  
least not in this form. However, she does have a tendency to bring chaos with her. She doesnt purposefully cause it, and shes pretty good at fixing it, most of the time.
 
And yes her coloring gets brighter as she gets older. Similar to how birds get brighter colors as they get older.