You're probably hearing conflicting info because (a) laws differ from state to state and country to country and (b) the people giving you info may not be lawyers, actually versed in what truly happens. They might be offering up their own anecdotal information, which may or may not apply.
Have you actually spoken with an attorney about this? If you haven't, you should. This is big time, if you're going to give up rights to your kid, and you need an expert to handle it and help keep you from potentially signing away rights where you might regret that later.