Breeding size?

Alright so I cant seem to remember when one of my breeder females was born. (forgot to record it. ugh) shes sitting at about 185 grams. If i had to guess shes about 2 months old?

How old / what size (weight and stuff) before they should be bred.

I don't go by age but by size and my preference is to wait for the females to be between 220/250 grams.

I put groups together at weanling size and generally by the 8th or 9th week the females will be preggo and drop babies when they are about 12 to 13 weeks old.