She may already be pregnant
Wow, you scared me there! So I guess the planning is OK: she gets spayed in 2weeks, after allowing him to nurse a grand total of 4, 4 and a half months. He'll get neutered in september, when aged 6 months.
My female cat had her first/last litter at 8years of age. Only 3 kittens were conceived and only one made it (2 stillborns from lenghty labor). The kitten is now almost 4 months old and still nurses, in addition to eating a bit of dry food, wet food and whatever he can steal from my own plate...
