D.S.
Gloria,
I have potty trained many kids while running a nursery school and 17 months old is very young to begin trying. I am sure there are cases where it has been done however I am sure they are far and few between. My tell tale sign that it is time to start is if they are waking from naps and nighttime dry. Without that type of bladder control you will be changing tons of clothes and washing tons of sheets. There also must be interest on her part. With the new baby coming I would wait because many parents make the mistake of trying to train and sometimes the older ones regress just for the extra attention. Also, with potty training you must be consistent I think with a new baby and exhaustion you may not be able to do that. I would definitely wait until you can see her having dryer diapers and most importantly interest. Summer time is always the best time, less clothing and you can just let them run around in their underwear. Knowing how long it will take is an individual situation. I had both of my kids trained in one week, however I was at home with them and able to focus on just training. They were both around two and a half years old. Even at that age my son still had nighttime accidents. I know changing two kids is going to be tough and costly, however you could only be setting yourself up for extra stress with a new baby on the way. There really is no rush. Good luck on your family and your upcoming baby.