Ive still been having this problem.
I've been getting twins WAY too frequently since toddlers came out. I'm on my 4th household to have twins (in a row), I only wanted there to be single children for story reasons so I removed one of them, now shes an adult and had her own babies and again they were twins. It's literally every household I make, its getting really annoying and taking the enjoyment out of getting natural twins. Is this ever gonna be fixed or maybe some way to reduce the chance of twins in some settings or a mod at least?