I'm in very much the same situation as you. I'm also due in August and have a DD just turned 2 who I am hoping to have toilet trained before bubs is born. Like your little one, she's also having a lot of changes recently such as moving to a big bed and soon to go in with her 5yr old sister, also hoping to cut out bed time bottles and dummy ... so the next four months are going to be quite a challenge!!
Anyway, back to toilet training ... some tips I can pass on from TT my 5yr old would be to take your DD shopping with you and let her pick out a special padded toilet seat, some undies, some reward stickers and some pull-up's (or bed-time undies as we called them).
I also purchased a book on Ebay last week called "The Big Toilet - For Gilrs" which is FANTASTIC! It has all Australian words such as nappies (not diapers), wee, poo etc and has a little flush button which makes the sound of the toilet flushing to get them used to the flushing sound in a fun way. This is great for them to read while sitting on the toilet and also in helping them understand. The tip about having her practice with her favourite teddy or doll is also a great idea, and when the doll "does a wee", throw a huge party ... really go over the top (this may feel a bit silly ... but hey, noone else can see!). I also recommend going straight to the toilet as they are more familiar with this than a potty ... after all, when was the last time they saw mum or dad sitting on a potty?
The approach I took was to set aside one day and dedicate the entire day to helping your DD get the idea of TT. Cancel any plans, take the phone off the hook, have your mop and bucket handy and you're good to go! Put on her "big girl undies" and give your DD plenty of water to drink throughout the day giving her lots of opportunity to go to the toilet. Then, around every 20 minutes tell her it's toilet time (get really excited), and sit there for 5 minutes or so. If she does go, the praise must be huge (time for another big party!), and reward her with a sticker (we made up a sticker chart & stuck it on the toilet wall which worked really well ... if your DD doesn't seem motivated by stickers, try a smartie or tiny teddy etc everytime she has a success).
When she has accidents, it is so important not to get frustrated or angry at her, as this will only make her not want to use the toilet more.
We also went completely cold turkey on the nappies as this only confuses them if they're going from undies to nappies, to pullups to undies etc. So we used undies through the day, and pullups ("bed-time undies") at night.
Using these techniques, our first daughter picked up TT very quickly and easily, so hopefully it all goes as well this time round! I'm hoping to start on Monday next week, given I have two weeks with no school drop-offs and pickups ... so fingers crossed!
Given we're both in pretty much the same situation, would be great to chat and share tips on how our little ones are coping with the changes. Are you in the "Due in August" group, in pregnancy & birth? If not, you're more than welcome to come over for a chat. There's about 600 of us in there (well, seems like 600 ... August is certainly a very busy month!).
Take care & good luck smile
[Edited on 09/04/2008]
Jaida (6), Ameli (2) & Lacey (2mths) - SA