Stray momma cat??

I take in strays and find them homes. I found one a home and a few weeks later found out she was pregnant and I took another pregnant one into my home at the same time. They had the babies on the same day (May 12th). I found homes for most of the kittens already but Im holding them till July 4th when they will be about 8 weeks old. Meanwhile the mom cat I have is crying to go out all the time. I cant afford to get her fixed however there is a program that will help me get her fixed. They said that it would be ok to get her fixed even though her babies will only be 6 weeks at the time of her spaying cause the flow doesnt stop as long as the babies are suckling but Ive read things saying just the opposite. I just dont want her to go back out there and have more babies for me to have to find homes for cause the lady that lived here before me had hundreds that she just let reproduce over and over and Im having to clean up this mess. Dont get me wrong I love helping the strays in the community but by her allowing them to keep reproducing it over populates the community and my neighbors aren't cat ppl so they dont care if they live or die. What can I say Im an old softy when it comes to cats. I dont like see anyone/thing homeless it breaks my heart. If I can help I do. Anyhow, the main point of this rant is how harmful can it be for the mom to be fixed when her babies are only 6 weeks.

Try to find a rescue group or groups to help you.  And in my view, even if getting spayed dries up her milk it shouldn't be a big problem with 6-week old kittens unless they are rather backward.

I recently retired one of my breeding girls, she was spayed at 10 weeks still full of milk and returned home nursing them all right away. 

So it really shouldn't be an issue, unless the vet wants to wait until she's dried up.

Well done for caring

thank you guys I'm gonna go ahead with it cause she wants to be able to go outside and there is no way i will let her out otherwise plus if worse comes to worse I can bottle feed for a few weeks I know its not the same but they will be 6 weeks so I don't think that it should make a difference and they are actually pretty advanced they are 3 weeks today and they literally run all over the house and they sniff moms wet food like they are thinking bout eating it already but not quite there yet I love watching the babies play together its hilarious