We got two boys from a breeder two weeks ago. One is a Russian Blue (Zeek) and the other is a Siamese (Nibbler). They were born about a week apart and were roughly the same size when we got them. Nibbler was slightly smaller, but not much. In the last two weeks Zeek has grown quite a bit, but Nibbler doesn't seem to have changed at all other then his points darkening up. He's pretty tiny. Like fit in the palm of your hand tiny. The breeder said that the bloodline Nibbler came from has several dwarfs in it, so it's possible he could turn out to be one. At what age would we know for sure that he's a dwarf? And if he is a dwarf are there any inherent health issues associated with it that we need to be aware of?