Multiple Births: Twins, Triplets, and Quadruplets Explained

One: A single child born by a mother in any one pregnancy

Twins: Fraternal (non-identical) twins: Two children born from separate eggs fertilized by separate sperm cells. Identical twins: Two children who develop from a single fertilized egg that splits in two

Triplets: Three children born from the separate eggs fertilized by separate sperm cells;

Quadruplets : Four children born from separate eggs fertilized by separate sperm cells