I would say that the monkey works best with children who are closer to 3 ... they just don't seem to "get it" before then. There are other sleep training clocks out there and they probably work just as well. We just happened to settle on this one! As a parent you aren't off the hook once you purchase something like this ... you have to do the work of training them to stay in their room ... pointing them back to the clock every time. Also, if your child currently wakes up @ 6am every day you can't expect for them to stay in their room until 8am just because the clock says they should. You must start with reasonable goals with your child and work toward a time that gives you and your child peace!
You can check out all of them HERE at Amazon.com. Our monkey clocks are about half way down the page - and remember the clock is NOT a toy, do not be fooled into allowing your child to carry his/her monkey all around the house - it WILL break!!