Hi there,
Congrats on your new baby.
My Jadzia took about 1 1/2 to 2 years to get the idea to let us know she had to go potty and our Kira is just over a year old and she still doesn't really know how to let us know. We just watch for signs like running around as if looking for something, sniffing around, pacing etc. We also just try to keep an eye on the time between bathroom visits and take the girls when we think it's time.
It's a bit of a chore but now that Jadzia has the idea it's easier and we expect Kira will get it before long.
I think the problem with my girls is they think they are giving us clear signals, it's just that we had to learn what their signals were LOL.
Oh, also I will say that Jadzia doesn't always whine or bark when she has to go, she usually just sits quietly at the back door with a "well, I'm waiting" look
Hope this helps.