That would depend on the size of your girl. If you mean she is 7 pounds  and he's 14 pounds, or is she 4 pounds and he's 8??

I would be more concerned with the size of the girl (meaning SHE needs to be a decent size) than I would the size of the boy.

Linda
Fultonblue Persians & Himalayans
www.Fultonblue.com

I'm not a Persian breeding expert by any stretch of the word.  But, my queens were all around 4 - 5 lbs, when I got them.  I was told sometimes, they are a bit low on weight, until they breed?  The weights sound average,
with what I've experienced thus far.

Not sure, I'll leave it up to those who have been successful.

I would imagine it would be like humans, though: depends on the gal.  I had
friends in high school who were tiny, one had twins, and went back to being
her usual tiny self.

Some will have easy births, some will not.  Nutrition can help.