It's got nothing to do with sex, genitals or anything feeling good. It's all to do with him figuring out that he has body parts, just like he would have played with his feet a lot earlier in life, and the thrusting is just to do with learning movement and muscle control.

I hav a 6 month old son, so i now i know if he does this, its normal. Ive never seen my nefew do it, but i do have a little cousin (female) and she humped bean bags when she was 1 lol..

Ive seen on youtube baby boys doing thigs like that, their parents just found it funny tho.

 My boy did this too.  Very embarrasing for me when breastfeeding him in public.  He would put one of his legs between mine and the of other in the air (like an acrobat) and then start thrusting. 

This only lasted for a few months! It stopped without me doing anything.

I don't think it is related to finding his genitals - this occurred later for my boy.  Most probably due to bordom (they want to feed, but their brain wants to do something stimulating).

Congratulations for breastfeeding him so long.  My boy is still feeding at 16 months. 

If you wanteed to reduce the thrusting, Perhaps lift him up and down when feeding - so he gets a similar type of stimulation, give him something interesting to hold in his hand, pat his bum.  

We also play the 'where is baby" game. Look around for your baby, ask "where is -insert his name-", then make eye contact with him. My bub thinks this is hilarious.

Good luck.

Do they ever grow out of it LOL?  sounds like a male thing more then a boy thing. My sons are the same

wow cant believe how alike some boys are. my son (almost three) started doing it when he turned one. i read up on it and i got advice that i must not discourage it so i left it at that and ignored him if he did it. i found that he does it when he gets bored or tired or after a time out (probably frustration). and when he goes to bed he sometimes takes him pants down to play with it and laughs at it when it gets sort of hard and erect and then falls asleep within minutes. he also likes rubbing against teddies.

i think it is just a matter of them learning about their bodies and the functions of their penises. if he starts doing it in public i just tell him that it is not nice for little boys to play with their penis where strangers or other people can see him, then he stops.

My 2yo son does this as well and I have no idea why. He will thrust up against teddies, cushions and even me!! I ignored it because I didn't want to encourage it but I have no idea where he picked that behavior up from. He doesn't watch any "rude" tv and my hubby and I are never "intimate" in front of him so I look forward to hearing what other people have to say as well.