Twins have four different forms in their mother’s belly.

Walking on the street, a pair of twins dressed in the same clothes can always attract the envious eyes of pedestrians.

Some twins are almost the same in appearance and sex. This kind of twins, often [monozygotic twins], is two babies developed from the same fertilized egg.

However, the twins of a man and a woman, or twins that do not look very similar, may be [double-egg twins], that is, two babies developed from the fertilization of two eggs respectively.

Double-egg twins account for about 2/3 of the total number of twins and single-egg twins account for 1/3.

What do twins look like in their mother’s belly?

The [living conditions] of the baby in the mother’s belly are general, and the [housing area] is very small. This [room] is what we know as the [placenta].

Before the baby is born, the placenta is not a disk. It consists of the amniotic membrane surrounding the baby and the [chorion] and [decidua] linking the uterus. You can think of the [chorion] as a base, the amniotic membrane as a glass cover, and the whole placenta is like a glass ball growing on snowflakes.

More specifically, the [base] can bring about material exchange, just like the water and electricity system in our house.

The vast majority of double-egg twins are [double chorionic double amniotic sac twins] (spaces are used to help everyone break sentences, the same below). Compared with houses, they are [double villas]; However, monozygotic twins evolve into:

1. Double villa type

In the early stage after fertilization, the same fertilized egg is completely divided into two, which can develop two independent placentas. The water supply and power supply of the two have a set of systems and do not interfere with each other.

This is called [double chorionic double amniotic sac twins].

2. Two-room one-hall suite type

Twins share a placenta, like a house with two rooms and one hall, sharing a toilet. The two rooms are closely connected and the power supply system is shared.

This is called [single chorionic double amniotic sac twins].

3. Standard Room Type of Hotel

Two independent fetuses share a common amniotic cavity and placenta. The two fetuses wander freely in the same space.

At this time, the easy risk is that the two umbilical cords are intertwined, which is very dangerous.

This is [single chorionic single amniotic sac twin].

4. Conjoined twins

Conjoined twins are conjoined babies, which are very rare.

There are many kinds of conjoined fetuses, most of which are connected to the chest and abdomen, followed by the buttocks and ischium.

These two points, twin mothers should keep in mind

Clinically, [single chorionic twins] have more troubles than [double chorionic twins], so it is very important to clarify the chorionic nature of twins for prenatal assessment and pregnancy management.

After all, doctors pay very different attention to and treat single chorionic twins and double chorionic twins. Among them, [single chorionic twins] are more difficult and require more rigorous prenatal examination by experienced doctors.

In order for both babies to develop healthily, pregnant mothers should actively do the following two things:

1. Do a good job of examination in early pregnancy,

Ultrasound examination, in the early pregnancy to distinguish twin pregnancy chorionic sex is the most accurate. More than the early pregnancy, if you want to accurately distinguish chorionic sex, the difficulty will be relatively large. Therefore, don’t go to the hospital to queue up because you feel that there is nothing to check in the early pregnancy, be sure to go, obey.

2. The first B-ultrasound is very important,

For the diagnosis of twins during early pregnancy, the first B-ultrasound sheet must be kept well.

The next time you see a doctor, remember to show it to the doctor, which is very important for the doctor’s subsequent judgment.

It is not easy to have a baby, and it is even more difficult to have a pair of healthy twins, and to cherish them. It is better to pay attention to the Good Pregnancy Academy (public ID: dxyunshi) and see what is the difference between having twins and having singletons in all aspects.

Responsible Editor: Ji Lingyan