Twins or More

Identical vs fraternal twins differences

Identical vs fraternal twins differences

The basic biology behind twin types Twin pregnancy begins in one of two broad ways. In a monozygotic pregnancy, a single egg is fertilized by a single sperm, creating one zygote. That early embryo then splits into two separate embryonic lines, which develop into identical twins. In a dizygotic pregnancy, two eggs are released in […]

High-risk multiple pregnancy and twin complications

High-risk multiple pregnancy and twin complications

Why multiple pregnancy carries higher risk In a multiple pregnancy, the uterus, placenta, and maternal cardiovascular system must support more than one fetus at the same time. That extra demand explains why complications are more common than in singleton pregnancy, and why the risk generally rises with fetal number. Twin pregnancy is already higher risk; […]

Pregnancy with twins and triplet pregnancy risks

Pregnancy with twins and triplet pregnancy risks

Why multiple pregnancies are considered higher risk A multiple pregnancy means more than one fetus is developing in the uterus. Twins may be dizygotic, arising from two separate eggs, or monozygotic, arising from one fertilized egg that splits. Triplets can occur in several combinations, such as three separate embryos or one embryo splitting in addition […]