Well I do understand that I have been a little out of the loop but I can offer some insight on this subject.
I have a male cat the I bought out of a pet store (a bad one at that). Anyway when I brought him home he was covered in fleas,ear mites, and worms. But I loved him and it didn't much matter how sick he was. He had some issues with separation from his siblings which were still at the pet store. He would not sit still always crying all night long. Well I found out that he needed the face rubs that his mother must have given him. Once I did that I was forever known as Mommy. He is 5 yrs old now and about 18 lbs and the only way he sleeps is in my hair kneeding my neck and ratting my hair into a great big mess. I really don't think that his reaction to you is out of the ordinary he just really loves you. And I guess you should feel blessed that he has chosen you because up to this point he must have had no one that the little guy could have really counted on. My orange tabby Tucker is my boy there is no doubt in my mind that he would be miserable without his mom. I love that especially since I know that I am his favorite he is always there for me even when my husband isn't around. He is my bestfriend and look at your baby as a bestfriend and the connection with your little boy will pay you 10 fold. I promise!!