Continuing to want to nurse

We got our cat from a shelter, and we think he may have been removed from his mother early. He insists on sucking my wife's hand several times a day as if he's nursing. She has tried several ways to break him of the habit, and nothing has worked so far. He's almost 7 months old, any suggestions?

Yes, it's likely the kitten should have stayed with mother longer. It will stop eventually.
   
This is actually a copy of my answer to another post on this subject:
   
"I spent 2 years being nursed on by Fred. He finally tapered off.
   

   
Your kitten...is still fixated on being mothered, & you're it. It's normal; the kitten could just be immature. If things get too painful, gently detach the furry child & scratch the ears.
   

   
In fact, you could try buying the cat a plush dog toy, the little one may snuggle up to that as another mother substitute.
   

   
Enjoy it while you can; it'll pass, & you'll find yourself missing it when the cat's 4 years old & a mature adult."

Thank you, that's encouraging.