1. TWINS

2. Monozygotic twins
Monozygotic twins (identical twins) are identical genetically.
Identical twins that share the same
placenta occur in only 1% of the
pregnancies. This is due to a
relatively late egg split. In utero mortality rate is about 50% due to
cord entanglements.

3. Identical twins in utero

4. Triplets, quadruplets, quintuplets etc.

5. Conjoined twins
An extremely late split of identical twins can cause conjoined twins. They fail to separate completely.
Abby & Brittany Hansel

6. Dizygotic twins
Dizygotic twins (fraternal twins) are as similar genetically as any other brother or sister.

7. Dizygotic twins

8. Fraternal twins at 32 weeks

9. President Bush’s Daughters
Fraternal twins (dizygotic)