Getting another gremlin?

So I have two concerns with getting another mc, one being my current apartment size and the other being I will most likely be moving in around 6 months from now. My current apartment is around 650 sqft but I feel like my current girl is pretty happy with the space. I am a bit worried about if I introduce another kitten into the apartment they won't have enough space so I was wondering if anyone had a similar sized space with two kittens and how it goes. Also like I said I will most likely be moving in around 6 months and I am not sure if introducing a new kitten into a new apartment just to move it soon after is the fairest decision for the kitten.

I ended up deciding on only getting one mc earlier in the summer because it was my first time owning a cat as well as the first time I'm taking care of a pet by myself, with the idea that I could always get another later. I'm not exactly in a rush to get another kitten but I felt like sooner rather than later so that they could have more time to bond while my first girl was still young.

meow.