It might actually be two baby’s, both main leads might be the father.
The baby fox was older and there was another thing trying to crawl back into his stomach.
Mr fox main was the first one who fucked him so the fox is his.
Prosecutor fucked him last and a little bit after a month or week so second baby might be his.
I don't think he has two baby, he took usg pic twice so far and both times showing he only has one baby. His dream is confusing but i reread it and there's only three people appears in the dream : the omega (shown both as himself and as his symbolic fox), little fox (or puppy?) with brown fur that most likely symbolized his baby, and big white snake that seems to symbolize the white haired drug-dealer alpha. The one who seems trying to crawl back into his stomach is just the little fox with brown fur.
Yes, but you can get pregnant with a second baby if an egg is released during pregnancy.
Seems like the fox omega have feeling toward white haired alpha (and that feeling could be mutual) but his baby's daddy might be the prosecutor based on baby fox's fur color in his dream and the prosecutor knotted him when he's near his heat cycle