How do I find who is the mama?

[Shontelle]

I have just found some baby rabbits in a cage with 4 other rabbits. The cage has a mama and her 3 children who are about 5 months old however I don’t know their sex. I want to seperate the rabbits so no one harms the newborns but not sure who the mum is.

 

[chickens really]

She will have bigger nipples that look like they have been nursed from. At least my momma Rabbit did.