Dysfunctionalme - you would have had gun with my DD then, trying to train her at a year old. Considering there was a hormone she NEEDED to be able to control her body that she didn't start producing until she was 12y9mo. Until that point, that hormone had to be given to her as a melt able tablet.
All attempting to PT her at a year would have gone is distress her. It wasn't until she was over 4yo that it was discovered that her body wasn't producing that hormone.
No amount of PT could have helped that.
My DS1, on the other hand, took his own nappies off at 18mo, and has NEVER had an accident.
20mo DS3 took his nappy off today, so I left him in the front room with the potty. When he inevitably weed, he cried in distress. So he is obviously NOT emotionally ready, even if he is as near as darn it physically ready.
PT DC's in a regimental style allows for no differences in emotional stability.
Some DC's may well be ready to start what would be a very loooong drawn out process if you start at 1yo PT at 1yo. What about those that walk later? Do you still PT a non mobile 16mo?
I have spoken at length about this issue with women of ALL ages. Those that say their babies were PT by 6mo/1yo were ACTUALLY using elimination communication. Which just DOESN'T fit into modern life for most people these days. I only know of one person able to do this, and she is a FT SAHM with an Au Pair to do the school runs.
If someone is out at work, and their child with a childminder or Nursery, I can't see either of those doing elimination communication when they have other DC's to care for.
It is impossible to do elimination communication with a baby when you are doing a school run, either you end up pissed on or crapped on, or you put a nappy on them for the school run. Or you stay in and have an Au Pair to do the school runs.
However, back in RL, where the majority of us DON'T have the money to be a SAHM AND have an Au Pair, elimination communication doesn't work.
I used it with some success with my disabled DS2 when he was non verbal and non mobile, and he was dry during the day not long after 2 1/2, but HE wasn't what I would call 'PT'.
Elimination communication has its uses. But it's not a catch all in modern society, where most mothers are not SAHM's with no other time commitments like school runs to do.