I dont think you can really tell from kittens who may end up being bigger and who may be smaller. Usually the girls tend to be smaller than boys, however this is not always true. On the plus side, another cat really isnt going to take up much more room.
As for the sex of your cat, it should not really matter as long as everyone is fixed. Some cats however do not like another cat coming into their home. If your cat is old and grumoy, she may never like the new cat. They will probably grow to tolerate each other in time...they may never be good buddies. Then agian they may end up being best freinds. It is really hard to tell.
I would say, if you and your mom agree that you may have a new cat, go with your heart. Pick a kitten that you fall in love with and dont worry if it is a boy or a girl. The size will not matter much either, because a big cat and a small cat both really take equal space in a house if you think about it.
Get another litter box, especially if your older cat does not like the new cat. You can keep the boxes next to each other if you want, as long as they have the option of their own box. Also get a seperate food and water dish for the new cat. Then you should be all set! Good luck! Let us know what happens ok.
As for the sex of your cat, it should not really matter as long as everyone is fixed. Some cats however do not like another cat coming into their home. If your cat is old and grumoy, she may never like the new cat. They will probably grow to tolerate each other in time...they may never be good buddies. Then agian they may end up being best freinds. It is really hard to tell.
I would say, if you and your mom agree that you may have a new cat, go with your heart. Pick a kitten that you fall in love with and dont worry if it is a boy or a girl. The size will not matter much either, because a big cat and a small cat both really take equal space in a house if you think about it.
Get another litter box, especially if your older cat does not like the new cat. You can keep the boxes next to each other if you want, as long as they have the option of their own box. Also get a seperate food and water dish for the new cat. Then you should be all set! Good luck! Let us know what happens ok.