Twins are children (two or more) simultaneously developing in the womb of a woman and born together. For a future mother a multiple pregnancy is a doubled load, and a great joy.
Twins can be monotonous and raznoyaytsevye. In the first case, a multiple pregnancy is the result of dividing one fertilized egg into several. Let's take a closer look at the second option.
How do the differently twins get?
The first case is when one egg after the fusion with two spermatozoa is divided into two. Thus, in the womb of a woman, two fetuses (or more) begin to develop at once.
The other case is more common, when the fraternal twins are born as a result of the fertilization of two ovules in a single menstrual cycle.
Most often, such a pregnancy happens in women after 35 years. This is due to age-related changes in the hormonal system, as a result of which two or more ovules capable of fertilization can ripen during one cycle.
Also, the birth of heterozygous twins often occurs after hormonal treatment or discontinuation of contraceptive use, tk. in these cases the woman's reproductive system works with redoubled force.
Prerequisites for multiple pregnancies:
- Mom's age is more than 35 years ;
- heredity: if in the family twins were born earlier (on the maternal line);
- taking hormonal drugs;
- belonging to a particular race (for example, it is noted that the largest number of twins are born in African tribes, less than in the rest - in the Mongoloid race).
Multiple pregnancy is under the scrutiny of doctors. Childbirth often goes before the scheduled time. The weight of infants is less than in single-pregnancy.
If the pregnancy was without complications and the birth was successful, the further life of the newborns and parents proceeds as well as in any family where the baby has appeared. Here only babies here not one, but several.
The fraternal twins have similarities as ordinary brothers and sisters. They have a different set of genes and can even be from different fathers. Therefore, unlike identical twins, it is not surprising if they have different eyes and hair colors, different characters and rates of development.