These wings are there from birth. This is what gives them their flying speed. But if broken or damaged, they must be healed in order to regain flight.

Being born in the faewildes has granted inherent knowledge to the fairies. Giving teaching them some spells they learn at a very young age. 

Darkvision out to 120 feet.

As an action a fairy can cast reduce/enlarge on self once a day. This is not a concentration spell when cast this way. It also when cast as reduce makes the fairy 6 inches tall. When enlarged they stand as tall as an average human. They still retain their wings, but lose the ability to fly if enlarged and speed is halved if walking while reduced. 

Natural armor class stands at 15 plus dex modifier