Babies first hair cut?

My son is 14 months old and since he was 1 I've only trimmed up the bottom part of his hair near his neck, as it grows like a mullet and looks weird as he has a small amount hair on top of his head (SO has a mullet hair cut so hes impressed that his son has a natural mullet too) ive heard that if you cut babies fluffy hair the hair will grow back quicker and longer? Has anyone tried this? I've just gone and trimmed my sons whole head with a comb and scissors (somewhat like hair dressers do) in hopes he will have hair and i can give him a little lay down mohawk or some type of little boys hair cut.