I recommend that you consult with a family law attorney about the specifics of your case and intentions, so that you will fully grasp the ramifications (if any) about your proposal.
Answering this question does not create an attorney-client relationship. You should seek a full consultation with a licensed attorney before relying on any advice offered through this website
I agree that you should consult with an experienced family law attorney. Most attorneys offer free consultations. However, you should know that (a) custody refers to decision-making authority only and you should both have joint and (b) having court ordered placement rights awarded to Dad would be enough to accomplish your goals. He would then have the right to come get his child for placement or you would have to bring the child to him somewhere.
Signing over custody and placement is not a good idea as that could come back to haunt you down the road, especially if your relationship deteriorates with Dad.
Talk to an attorney or the Child Support Enforcement Agency in your county to determine how to establish the court orders for your son that will be best for him.
Consult a local family law attorney to discuss your options. Obviously, this is very important and you will want to make sure you have thought about all available options and taken the necessary steps to make a good decision for you and for your child. Good luck.
As a minor, the Court will appoint a Guardian ad Litem to represent your best interests in this matter. If there is an underlying paternity action in this placement, you can encourage your boyfriend to file a motion for modification of placement. At least you will have some legal protection of your interest through your Guardian ad Litem. By providing the father sole legal custody, you may be jeopardizing your own custodial rights and future placement if the two of you are suddenly not aligned in interest.