Feather problem

[Tenleigh]

My 4 month cockatiel have been losing tiny feathers. This just started last night, he’s too young for molting. He lost about 15 feather (in 3 hours) this morning while cleaning himself. He never losses feather for 4 months I had him. Should I be worried? Is he feather plucking? Here’s some of the feathers I found laying around.

 

[FeatheredM]

My cockatiel is pretty young, around your cockatiels age, and his head is molting.