We've started potty-training our 20 months old girl, during a 10 day vacation (from work and daycare). At first she would not sit on the potty, but that improved after the first few hours and now she mostly has no problems with the potty.
The problem is that she doesn't seem to know when she is about to urinate - she will go around the house or play and suddenly start peeing. When she notices this she would start saying "pee pee", but we are pretty sure it's from seeing the pee come out or feeling it run down her legs, and not from knowing that she is peeing.
We've tried various suggestion we've read on-line - having her in underwear or naked, praising (and rewarding) every attempt to use the potty (and the few successful hits), playing with a doll that also goes potty, asking her if she needs potty (the answer is always "no", even if she would then pee 30 seconds later), sitting her on the potty for a 10-15 minutes, etc. We are careful to have a positive atmosphere, never scolding her about the accidents.
She can go for an hour or more without peeing, both when with a diaper and without one. She also seems to be able hold peeing - sometimes she would pee, notice it and stop. Then pee a little again after 5 minutes. This might go on a few more times, until she lets go a lot of pee.
We're worried that she is just getting frustrated - she seems to understand that peeing is in the potty, but doesn't know when she needs to pee. Is this something that is developed during the potty-training? Or is this something that just has to come with time and we can't really do anything about? Since toddlers (and babies) have been (and still are in various other cultures) potty trained this young and younger, apparently without a problem, we hope that she will soon learn to recognize when she needs to pee.