my baby is 2years old , once a day the bike felt down infront of him, that day on words he had fear of going outside and he ran into home when he heard vehicles sound , and also he was not coming into kitchen because he also had fear of cooker whistle, if iam in kitchen he was crying more until I come back, he was not going to anyone, always he stay behind me, why he had this fear, and how to treat him, please explain me