My guess would be brown classic tabby and white, with the lighter reddish brown area near her ear being part of her tabby pattern... but she might be brown patched tabby and white (also known as torbie and white). You may have to wait and see.
It's hard to say if those are true red spots or just tabby shading. It might be easier when they're bigger.
What color/pattern is their mother? And the father, if you know who he is.
Oh wait they're from separate litters, aren't they? Ivy looks older than Avocado. Anyway, tell us what you know about their parents and it might be easier to say if they're torbie or not.