Answer:
I am an object which is used in baseball during the day I can't be seen at all
I am bought by the yard but worn by the foot. What am I?
A caribbean shape that makes ships disappear.
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
No matter how hard you hit me, no matter how much I hurt, I'll always go for a laugh. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.