1st child DD: 2 years
2nd and 3rd children, Twins: DS 18 months, DD 2 1/2 years
4th child DS: 2 years
5th DS: 2 1/2 years (urinating), almost 3 years old (bowel movements)
My earliest child the twin (boy) did it all himself. I hadn't even tried to potty train the twins. One day at 18 months, I saw him sitting on the toliet going "number two." I still put diapers on him for his nap and at night, and he pulled them off as soon as I left the room and slept barebottomed with no accidents. He got angry when I tried to use diapers on him. He also pulled a stepstool up to the toliet so he could stand to urinate. He was by far the easiest to potty-train of any of my kids.