Introducing a girl to my herd - guinea pig jigsaw puzzle!

[GarterSnake]

Hi. I have 17 piggies. 2 x 2 boys. And one neutered lucky boy with 8 ladies.
I had two rescues that were pregnant. Before I found out one of them was pregnant I had put her with the herd. She was a bit feisty and got into some scraps (her ear got bit!) but it was ok. When I found out she was pregnant I removed her from the herd, and she had one female baby. I’d also kept the other pregnant female separate, and she had one baby girl too.
My problem is I tried putting the 2 mums and their girls together - intro in clean neutral space. Almost immediately fur ball fight so I separated.
I also tried my feisty wee mum with another lady in the herd - fur ball fight ensued. She is all sass with her humans and then all chattery with other pigs (except no fights with the daughter - yet!)
I was hoping all the girls could join the herd as I have a huge space. But how should I go about this now? Do I need to keep at least one pair of girls separate?
Appreciate your suggestions! X

 

[Piggies&buns]

How old are the babies?
There is a section at the end of this guide explains why bonding new mums is so difficult.

https://www.theguineapigforum.co.uk...y-care-post-birth-nursing-and-weaning.109389/

Equally, even if the babies are past weaning age if the sows are not compatible then a bonding will not work.

All you can is try a neutral territory introduction and if they are not compatible then they need to remain apart

 

[GarterSnake]

That article helps, thank you. The babies are 4 and 1 weeks old. Shall I keep the mums separate fir a few more weeks?