Many moons ago we and the school tried to toilet-train Oliver. It resulted in UTI. We thought the problem was that Oliver could hold his bladder but had a phobia of urinating in full view of onlookers.
This time round, the school had been training him for about 2-3 weeks already and was pretty successful. We were told that he could indicate to the teachers that he needed to go to the toilet.
The other day at home, I heard him said that he wanted to pass urine, and on Friday while we were strolling near Capital Tower, Sophia heard him said that he wanted to pee pee. Both times he urinated after his diaper was taken off. Yeah!