Is there a bug atm that makes sims have only girls?

"Pamtastic72;c-17085613" wrote:

ETA: it's my understanding that the game tries to balance ages and genders in game. So maybe you're experiencing a lot of girls born because you already have a high male population.

I've heard this a lot so I found my situation interesting. I started a fresh save to do a 100 baby challenge and I added a bunch of men to my game. I haven't got far yet but like I said earlier my challenge sim had all boys. 7... not relevant but 2 sets of twins.