How do twins, triplets, quadruplets, etc fit in 1 womb?

While they tend to be smaller, they aren't always - my twins were born just 100 grams less than both my niece and my nephew, who were born separately. I also gave birth at 37+4, which is considered full term. read more

A fertilized egg is made with one egg and one sperm. If it splits in two, which happens sometimes, you have identical twins. If one of those eggs separates again, you’ll have identical triplets, and so on. All the babies start with the same gene set: They’re either all boys or all girls, and they’ll look alike. read more