My DD is almost 2 and we just finished our training period. She's only had two accidents in the last week, so I consider the process to be a success.

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I know it's probably very different to train boys, and perhaps older kids too, but I thought I'd mention what we did:
We started pre-training weeks before by reading potty books and talking about how soon DD wouldn't need diapers anymore. We then started the actual training on a Monday morning right after breakfast. That morning, she got to open a big wrapped box that had all of her new potty stuff inside (toilet insert, foaming hand soap, training pants, step stool, flushable wipes, chocolate chips for treats and a couple of pairs of "underwear" for her doll).
I put DD in training pants right after breakfast and we spent about a half hour showing the doll how to use the potty. Then I put DD on the potty (she'd already had her first accident by this time) to practice. That day, I had her sit on the potty every 20 minutes or so, and asked her every five minutes if she needed to pee pee (more as a reminder to be mindful of her body than anything else, because she always answered "no").
I watched her like a hawk all day long and was quickly able to figure out some signs that she needed to go: fidgeting, sudden running back and forth between activities, squatting, grabbing herself and squeezing her thighs together.
Every time she had a success on the potty, she received a couple of chocolate chips and I made a big deal about it with praise, hugs, etc. Sometimes, when I knew she had to go soon, we'd hang out in the bathroom and read books (sometimes while she stood around, others while she sat on the potty).
I think just spending a lot of time in the bathroom and on the potty without pressure to go really helped her get comfortable with the idea of using it. And once she started actually peeing and pooping on the potty, her comfort level skyrocketed and she had no problems using it after that.
Now I take her into the potty whenever I sense it's time to go, meaning if it's been a while since she last went or if she's showing signs of needing to go. We also go at regular intervals each day: before bed, before we eat, before we go out, when we get home, before mommy gets in the shower, etc.
I hope this helps a little. Good luck, mama!
