My cat Beth does the same thing. She is almost 5 yrs old and still does the nedding, sucking thing. I have given her a couple of old night shirts that have become her "suckies". There is one in every room of my home. As soon as she starts, I tell her " get your suckie" and sure enough she finds the closest one, drags it up in the couch/bed, puts it in my lap and goes to town with it. She usually only does this right before she falls asleep. I am still waiting for her to grow out of it.(don't think it is going to happen) But I figure if it makes her happy and she's not hurting anyone, it's okay with me. Good luck with your little sucker.