22 months is way too young to potty train for most kiddos in my experience. This guy isn't even 2. Boys are notorious for taking longer and it seems those who start early take the longest and their parents have the hardest time.
I guess I would ask her if her child is really showing signs of readiness. Also, is he talking? If he can't tell them he needs to go potty (or at least communicate it via signs), I think she's setting herself up for a whole world of pain. Here are some readiness signs I found online:
* Your child stays dry for at least two hours during the day and is dry after naps, which indicates that she's able to remain dry for an extended period of time.
* Your child can follow simple instructions, such as a request to sit down or remove his clothing.
* Shows an interest in wearing underwear.
* Walk to and from the bathroom, sit still on his own for at least a few minutes.
* Shows obvious signs of discomfort when the diaper is soiled.
* Has predictable bowel movements on a regular basis.
* Expresses an interest in using the toilet or potty seat.
* Indicates through facial expression, posture, or language that he's ready to use the toilet.
* Your child asks to wear grown-up underwear.
* Your child may be ready to begin when the diaper stays dry more and more often overnight.
* Your child will begin to notice the potty and want to sit on the toilet.
* The child may express displeasure with a wet or dirty diaper, or may not want to wear a diaper anymore.
My son was one of the youngest in his peer group and he was 2 1/2. Most of his friends were 3 before they potty trained. When they were ready, they "trained" in less than a month. They have to be ready or else you're wasting your time and getting frustrated over soemthing your child just isn't developmentally ready to do.
Sounds like he just likes taking his diaper off (which in our experience was NOT a sign of potty readiness but just toddler mayhem). I would suggest putting him in clothes that make that hard to do (ie overalls, onesies, etc.).