Tiny young children have very brief vocal cords resulting from which the frequency (or pitch) of their voice is rather high. This can be why their voice is shrill. Once the air molecules hooked up to our ears get started vibrating, the ears come to feel these vibrations as sound. https://vibrationisolatormaterial81246.webdesign96.com/29198108/an-unbiased-view-of-mason-industries-vibration-isolators