My son is 4 months old, and his scalp gets very flaky in the top, I have tried lotion but it dries it out. i have also tried vasaline but that only makes his hair greasy and still doesnt work. What can i put in it to help with the dry scalp that wont harm him. i also have this problem. ???

Does your baby have "cradle cap"?  It is a fairly common occurance with babies.  I've heard of people using jojoba oil on the babies scalp to help with the healing and reduce the flakiness. 

My son did not suffer this common malady and I don't remember what the typical treatments were back then.  They probably suggest other treatment these days anyway.