ok since u don't know roughly... now feed kittern food after she give birth. which mean right after day 1 the kittens born.
kitten food is high with nutrition, protein and fat.
a pregnant mother needs alot of this 3 main keys for her coming soon kitten. ofcourse everybody want a healthy mother with a healthy kittens right. if they only want healthy kitten but not mother, then this is abusing the mother for their own good.
a nursing mothers need kitten food, to produce good healthy milk for her kittens. she eats high nutrition kitten food, and produce it become milk. now the kitten will get all the nutrition from that milk. they grew happily.
you still need kitten food later own when the kitten start eating by themself. normally they will start eating at the age of 1 month and above. so the kitten food continues.
it is not easy to have kitten ehehe just like us, not easy to have kids. producing them is easy, but taking care need more $$$.
due to budget problem, you can in big amount. let say IAMS kitten (purple color) 9.36kg is RM132. For your cat, i think this 9.36kg can last for a very long time of period. maybe 3-4 months. which is like till the kitten born and can eat ehehe.
so buying the big pack is much more money saver than buying the small small packs...
acana is a good brand. im not sure how much they selling the big pack.
so now, list down your budget carefully so it won't "membebankan" you.

Even though it's a bit membebankan my pocket and a lot of hard work, but i'm happy if she n her "future" kittens are happy n healthy, actually cant wait to see her kittens already, n at least she got companion other than me especially at night. I have checked just now, The pet shop will start to sell new Acana Pacifica start from next month, it's RM158 for 8kg, more expensive and it's one formula for both adult n kitten. So, might switch to IAMS in future, but now i'll go for Acana Kitten 1st (old formula), it's only RM118 for 8kg. Is it ok if I feed an adult cat with Kitten formula in long term ?