How do I tell him that I have a newborn?

So I just had a baby but I left my childs father long before he was born. That being said, I've been single for months. This guy from my past messaged me and wants to get to know me as more than a friend. I changed my social media so he doesn't know that I just had a baby. I don't want to miss out on an opportunity to be with a good guy so how do I tell him about my son? I know most people may say wait to tell him but I don't want to hide my son or lie to this person. THANKS IN ADVANCE FOR THE HELP!