Twins can polarize people, as some couples love the idea of parenting two babies at once while others react negatively. Many experts believe twin pregnancies are more common than realized. Twins are either dizygotic, from two eggs fertilized by different sperm, or monozygotic, from a single egg that divided. In rare cases, conjoined twins are born joined together and may share body parts. Twinning occurs when a woman releases two eggs or a single fertilized egg divides, resulting in either fraternal or identical twins.

1. Twins

2. • The idea of having twins tends to polarise
people. Some couples say they’d love the
chance to parent two babies and others
react in an entirely different way.

3. • Many reproductive experts believe that as
humans we probably have more twin
pregnancies than any of us are aware of.

4. Not identical twins are
“dizygotic,” meaning that they
developed from two different
eggs fertilized by two different
sperm cells, while identical
twins are “monozygotic”

5. There are also, in very, very
rare cases, conjoined or
'Siamese' twins. These are
babies who are joined
together and may share some
parts of their bodies. Their
heads may be joined together,
or a different body part is
joined.
These twins come from the
same egg but it hasn't divided
properly. They are always the
same sex.

6. Twinning occurs one of two ways: either a
woman releases two eggs instead of the
usual one or she produces only one egg
that divides after fertilization. If she
releases two eggs, which are fertilized by
separate sperm, she has fraternal twins.
When a single, fertilized egg divides and
separates, she has identical or paternal
twins.

7. JAVIER BARAJA
PAULA BUNGARD
MANUEL
ARIAS
BY