To understand how twin babies live in their mother's belly, let's first take a look at how singleton babies live.
Each single baby develops from a fertilized egg and lives in a suite of their own.
In this house, there is a room for the baby to move and sleep - the amniotic sac, and a kitchen for the baby to provide food - the placenta.
Image source: Internet (invasion and deletion)
So, a single baby lives in a one-bedroom apartment with a room (amniotic sac) and kitchen (placenta) in the mother's tummy.
Do twins share a one-bedroom apartment in their mother's belly? Or do you live in a one-bedroom apartment each?
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There will be both cases, and it depends on how they came to be.
Twins are formed in the following ways: dizygotic twins and monozygotic twins.
1. Twin twins each live in a one-bedroom apartment and have their own kitchen to provide nutrition
Diazygotic twins are formed when a woman produces two eggs during the same menstrual cycle, which combine with two different sperm and develop.
They come from two different fertilized eggs, so the genetic material is not the same, and the sex, blood type, and appearance may be different.
Dragon and phoenix fetuses are definitely diazygotic twins; Twins who look very different are also dizygotic twins.
2. Monozygotic twins may live in a one-bedroom apartment, or they may share a two-bedroom or one-bedroom apartment
Monozygotic twins, fertilized eggs formed from one egg and one sperm, split into two.
They are equal to copying and pasting, and the genetic material in the body is the same, so the sex is the same and the appearance is similar.
This type of twin is determined by the time of division of the fertilized egg in the mother's belly by 3 minutes.
1) When the time of division is on the 1~3rd day after fertilization, each person lives in his own one-bedroom apartment, with his own room and kitchen.
Image source: Internet (invasion and deletion)
2) When splitting occurs 4-8 days after fertilization, live in a two-bedroom apartment with their own room and shared kitchen.
Image source: Internet (invasion and deletion)
3) When the time of division is 9~13 days after fertilization, squeeze into a one-bedroom apartment, share a room, kitchen.
Image source: Internet (invasion and deletion)
After reading it, do you think that the life of twins in their mother's belly is magical.