We started infant potty training with our firstborn when he was a few days old. From that first day forward, we used considerably fewer diapers over the course of a day. Whereas a non-IPTed baby will soil or wet 12 diapers a day, we were maybe using half that many. By the time he was a few weeks old, most all his poop was going into the potty, I'd say around 85%. Pees were a bit more challenging, but in hindsight I think this had more to do with keeping him in disposables, where a connection can be lost between peeing and wet feeling, due to the super absorbency. Also, we didn't IPT at night until later in his first year. By the time he was 6 months, we were using disposable trainers and occasionally Gerber Training Pants.
At one year we were into regular underwear at home, and in disposable trainers if out of the house. It's difficult to say when he was completely potty trained, because that depends on your definition. By 18 months, he was going to the potty, wore underwear all the time, and had very few accidents. All throughout our IPT journey with him, I was working very gradually on getting him into underwear. It was a comfort level thing for me. At first I needed disposable diapers, then disposable trainers, then cloth trainers, then undies. It was a baby stepping process for me, and that helped me to not stress out over misses.
Looking back, I wish I would've done cloth diapering full time with my first. (More on that topic in this post.) With our second baby, we started IPT from the time she was a few days old. We've gone from using
- Disposables while I was recovering from the birth process (about two weeks) to
- Cloth diapers full time (two weeks to 3 months) to
- Currently (3 months) we're using Gerber training pants when at home, cloth pocket diapers when out, and having very few misses
Keep in mind that I'm a stay at home mom, doing IPT full time. I've had faster progress with my second baby, probably because my confidence level is higher, she's more laid back, and we've got her in cloth all the time. Every baby is different, but I'm willing to bet you'll be surprised at how quickly your baby catches on!