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My name is***** and I can help you today. I have known several female cats who are not spayed, but have not had recent pregnancies who do develop milk and are able to nurse the kittens from another queen. It is very common for queens to accept other kittens from other mothers to share the workload of nursing them.
I would let both females be together if they want, as the hormonal smells from the birthing queen will help your non-birthing queen make more milk. You will also need to monitor the non-birthing queen and ensure that she is actually making milk for the kittens. Massage her nipples and squeeze them gently to see if milk comes out.Lastly, make sure there is free choice kitten food and water available for all of them.
Does this help? What other questions do you have?
How are all of your cats getting along now? Is the non-birthing cat making milk for the kittens? Please let me know, I was thinking about your big happy family today.