SITTING ON A LARGE QUARTER HORSE YEARLING

I HAVE A ALMOST 16 MONTH QUARTER HORSE THAT STANDS ABOUT 15HH AND WELL BUILT, I WANT TO PUT A SADDLE ON HIM AND SIT ON HIM, (NOT RIDE!!!) JUST TO GET HIM USED TO ME ON HIM, HE WILL DO ANY THING I ASK OF HIM AND IS EXTREMLY MELLOW, BUT WOULD I HURT HIM IAM ONLY 5'1" SO NOT VERY BIG

Your colt is only 1 year and 4 months old. He is far too young to be backed right now. I would wait until he is 3 at least so he can grow and strengthen in his muscles and body before he bears the weight of a rider.
   
Plus, you must remember that he is still a baby. He needs to mature mentally before he can cope with the stress of having a saddle and a human on his back. The backing and breaking of a young horse shapes him for years into his life, and if he is hurt, scared or injured it will affect him greatly in his future working life. I would seek professional advice on backing your youngster and never rush. Give him as much time as he needs to understand. He is on a learning curve in his life and needs to be taught with care, respect and time.
   
Right now your youngster should be out in a herd in the field just having fun being a horse! We ask horses to grow up far too fast.
   
We own a 5-year-old thoroughbred and even now he cannot take too much on board at once, he is not mentally able to cope.People seem surprised that he is not 'doing this and doing that' but what people expect he should be able to do, he cant, because he is, in reality, still only a baby!

Hi, i have a 1/4 clydiex gelding that i bred. Since the age of 8 months i have put my daughter on him bareback and led her but not for long. At 1 year old i put a saddle on him and led around with no problems. He loved it. He is going to be 3 yrs old in 2 weeks and is fully broken in. I only ride him once or twice a week. My horse is happy and still spends time being a horse in the paddock with his mates and he loves human contact. He comes running when i whistle him. I dont see anything wrong with you wanting to sit on your youngster. I think the more you do with them when they are young, the less hassle you have with them later on. Good luck.