I have a cat who just had kittens recently. They will be 3 weeks on August 25th. I believe her milk is drying up. The last two nipples are the only ones the kittens want and there are 3 of them. The rest are hard. I have another mother cat in the house who is nursing her own 4 kittens that are 2 days older. Her supply is running good. Should I try and have her nurse the other ones? The mom cats don’t get along so I don’t know how it will work.