I had a child start once that screamed, jumped up and down, hit the bottom of his play pen, through all of his blankets out for the entire nap time. At first I continued to go in, lay him down and remind him it's night night. My mistake... I stopped. I turned the monitor off. ( I could still hear him LOL ) and I enjoyed my quiet time. The other kids learned to sleep through it and now this one will sleep for a solid 3 hours if I let him. It took a month of sleeping no more then 20 min at a time and crying for the rest to get to this point. Now, he waves to me, says night night and that's it. When I go to get him he stands up and claps as if to say "yay! you've come to get me" LOL

stick with the crying it out. They don't do it forever.