Multiple Pregnancy

by | June 23, 2020

What is Multiple Pregnancy?

In the case of multiple pregnancy, there is more than one fetus in the uterus. Twins are most common, and are divided into one-egg and two-egg twins.

A number of things may indicate that a pregnancy is a multiple pregnancy. Often there are others in the family who have given birth to twins. Use of drugs that promote the possibility of having children (especially ovulation stimulation) increases the chance of multiple births. Numbers undergo most pregnant ultrasound screening during pregnancy week 16-20. The purpose is to determine the duration of pregnancy, count the number of fetuses and the anatomy of the fetus.

The prevalence of twin births is increasing in Sweden. The incidence of one-egg twins is 40% of twin births, while two-egg twins account for 60% of twin births. In Sweden, about ten births occur each year with more than two children.

Multiple Pregnancy


One-egg twitches occur as a result of the fertilized egg dividing earlier than two weeks after fertilization. Two-egg twitching occurs as a result of several eggs being fertilized simultaneously. More than two fetuses are either due to multiple eggs, or a combination of multiple eggs and further division.

The tendency to give birth to several children is hereditary. Stimulation of ovulation or test tube fertilization often results in multiple pregnancy. Increasing numbers of births in the mother and rising age increase the likelihood of twin births.


Multiple-pregnancy pregnancy is usually detected by seeing two or more fetuses on ultrasound.


In the case of multiple births, there is a risk that children will be born prematurely, and there is also some risk of other complications. For this reason, multiple pregnancy should be followed up by obstetrics specialist. The average pregnancy duration is 36–37 weeks for twins.

Sick leave from week 28 is common in all multiple birth pregnancies. Heavy work should be avoided. It is important to rest more than usual.

Parental leave and child allowance

In joint custody, parents are entitled to 240 days each with parental allowance, when one has had a child. Of these, 60 days with sickness benefit level are reserved for each of the parents. If a parent has sole custody of the child, he or she has the right to all 480 days. In the case of multiple childbirth, parents receive an additional 180 days for each subsequent child. In the case of multiple childbirth, both parents can be home at the same time and receive parental allowance.