Whether it is a natural pregnancy or ivory baby fertility in a family, if you can give birth to a pair of twin babies, it must be a joyous thing! But there are also many families who have successfully given birth to IVF twins with questions, why do IVF twins look less similar to the twins they usually look like, more like two individuals, or even one like dad and one like mom?
In fact, whether it is a naturally pregnant twin or an IVF twin, there is a certain chance that these two situations will occur: identical twins and fraternal twins. Ivy foci twins are more of a fraternal twins, developed from two separate embryos, so ivy baby twins don't look so similar.
Identical twins are when, after fertilization, the same fertilized egg splits during development, and what would have been a fertilized egg becomes two embryos carrying the same genetics during the split. Because their chromosomes and genetic material are exactly the same, their appearance, blood type, and even some physiological characteristics, susceptibility to diseases, etc. are very similar or even consistent.
Because of their similarity, it is often difficult for outsiders to distinguish. Most of these identical twins are babies of the same sex, and it is rare that the same oval dragon and phoenix fetus will occur. (Generally, when splitting, one of the two XY drops, forming xx and XY a male and a female dragon and phoenix fetus)
Natural pregnancy pregnant with fraternal twins, usually because of some factor in the release of two eggs at the same time and fertilization at the same time to produce two different fertilized eggs. Although both fertilized eggs receive genes from their parents, the genes they receive will be more or less different, and they will also have their own placenta during the development of the mother's belly, so there will be more similar aspects after birth than identical twins.
In IVF fertility, after assessing the woman's physical condition, the doctors will transplant 2 blastocysts into the womb according to their wishes, so that the probability of giving birth to IVF twins will be much greater. Twins conceived through IVF are also the fraternal twins we mentioned earlier.
IVF twins will have some slight differences in appearance after birth, much the same, some IVF twins in addition to gender differences, appearance are with the parents, may also be the appearance of personality and other aspects, one like the father and one like the mother, which is also sometimes the reason why we see the twins look and personality habits are large.