D.H.
My daughter is the same age and has been working on potty training since July or so. She could care less when she has an accident either. We use stickers for number one and popsicles for number two. We let her put her stickers right on her potty chair and she loves it. She still has some accidents at daycare, but not at home. We do songs and she has her baby dolls go potty too. I doubt she has any understanding of the baby coming when it is so far away and she is so young. I am due in a few days and my daughter doesn't fully comprehend it. Good luck.