If you want to give this little kitty a good home then do it.
One extra cat won't be a bad thing, and it's easy enough to keep the house tidy - I find it easy and I have a few cats and a dog.
There's so many old wives tales floating around, the amount of times people have said "you'd better be careful with cats around the baby"! How many times are you going to leave your baby alone with the cats hanging around?! None, I'd say!
And if new kitty and Aber get on well then new kitty will be a welcome addition for Aber seeing as you'll be busy with your baby.
But hey, that's just a crazy cat lady's opinion
