how do you get triplets?

My Sim had triplets on the first go. I had just bought city living and the apartment I lived in had the "on ley line" trait, and the magic happened or should I say the nightmare....it was horrible. I find the Sims 4 is very difficult for raising Children, I have never had one reach older than a toddler lol, I end up quitting the house or whatever. The triplets was unbelievably hard, I did raise them till a toddler, then left that house lol