My 2 guppies are in seperate isolation boxes. When do they give birth?

Both guppies have dark red gravid patches and in the community tank the males just stick around with the females.My 2 guppies are in seperate isolation boxes. When do they give birth?
You really don't need to isolate them yet. When you notice they're really getting huge (they'll get pretty fat!), and you see them staying near the top of the tank, or trying to hide by themselves,that's when they're getting ready to give birth and you can isolate them:)My 2 guppies are in seperate isolation boxes. When do they give birth?
unless the female is already pregnant then she wont give birth, they have to have mated first, then seperate them!