I have a son who is 2 years and 4 months old, and a 4-month-old infant. It came to our attention that the toddler was scared of the sound from a toy, such as an electronic toy car beeping or flashing the light, or any other toys that make sounds. He would cry out loud at the sound and rush into my arms or his mother's.
We also noticed that:
It mostly only happened with toys - he shows no such emotion when hearing the sound of a real car or the likes.
It didn't happen when he was even younger, as far as I recall, he was fine playing with those toys at age 1 or so.
Also I'm always a little concerned about my son being too attached to us, as a result sometimes I decline his request for a hug and encourage him to walk on his own - am I right or is it too early to teach him to be independent and tough?