My dd is 2.3 years and is mostly a happy, sociable little girl. But recently she's developed a fear of noises such as birds singing and police car/ambulance sirens, and also gets edgy if she hears a car or motorbike going past the house in the evenings. I've explained that the birds sing because they're happy (apart from a malevolant old rook which sits on a tree behind our house and makes a real racket at times - can't say I blame her for being nervy of him/her!) and that the police/car ambulance is going to help someone, not us because we're all well. She then gets anxious that the bird/vehicle might try to get in the house. At this point I explain that birds live in trees and can't get in the house, and that the vehicles are too big to come in and anyway they live on the roads. She repeats what I say a couple of times as if to reassure herself and then seems fine. Is this a normal thing? And am I handling it correctly? It's hard trying to explain things I take for granted in a simple enough way for her to understand! I want to reassure her without saying anything that will inadvertently make it worse. Any help/advice gratefully received!