Hypnosis is real.
But the results one may get from a CD or other means to become a baby, bedwetter, or diaper dependent differ, I think significantly in how they are received and the quality of the hypnosis given.
I have seen people truly hypnotized and doing things that can’t be explained other than they were in a hypnotic state, but this was in an in-person hypnosis setting.
I have tried ABDL types of hypnosis CD’s and actually experience a wide difference of success and failures. I have seen the effectiveness of some of these and experienced the loss of control on a few occasions, that I can only attribute to the CD and the suggestions that were there. But on other times, the CD’s have been like a 4th of July firework that fails to explode and just be a dud.
I haven’t really got a good explanation for why at times I have experienced what I think is a real hypnotic reaction and other times not. Perhaps it was all in the mind. LOL 
In the bigger picture, I look at myself and why I tried these things, and what I hoped to accomplish, and I guess my own opinion is that if you want to experience being a baby, incontinent, or many of the things that the hypnotic products suggest, it isn’t a bad thing to use hypnotic suggestions, but at the same time… how about just being comfortable with who you are, and if you want to be this way, then just do it?
Rather than relying on someone else to tell you you don’t have control, or to wet your diaper, or act as a baby, or whatever it is that you would seek hypnosis over… just be that way. Hypnosis, as I understand it, is about suggestion. About someone getting you into a trance-like state and suggesting you do something.
Instead of relying on someone else’s suggestion, listen to your own. If you want to wear diapers, then do so because it is what you want to do. If you want to wet in them, then rely on your own desires and let things happen. Some of the most fulfilling hypnosis I have experienced is from a CD I obtained from the library about self hypnosis, and it simply helped me relax into a state where I was able to make my own suggestions and experienced temporary loss of my bladder and feeling very much like a baby.
While hypnosis is a real thing, I doubt that many of us will ever really be able to have a hypnotist understand and agree to hypnotize us to being like a baby. Recorded and unpersonalized CDs might work for some, but I think to have a real hypnosis result it is much more likely to have to come from an in-person session with a hypnotist that understands being ABDL and willing to help plant the “seeds” that our own minds and persons must grow.