What factors affect the sex ratio of test-tube babies?

The science report recently published a study of The sex thewire of singleton and twin delivery offspring in assisted reproductive technology in China discussed may influence through assisted reproductive technology (ART) The factors of sex ratio at birth of The baby.

The study found that the blastocyst transplant, which transplanted embryos to the mother on the fifth day of development, was associated with an increase in the number of baby boys born.

Intracytoplasmic endosperm injection (ICSI, single sperm injection into mature eggs) was associated with an increase in the number of girls in the twins.

ICSI is a kind of assisted reproductive technology (ICSI).

It is estimated that assisted reproduction technology has promoted the birth of more than 5 million babies worldwide.

Past research has shown that the sex ratio of babies born through assisted reproduction is not the same as those born with natural insemination.

But until now, no research has been done to investigate the effects of assisted reproduction techniques on single and dual births.

Xiong fang, ling xiufeng, ling xiufeng and Chen li of nanjing medical university in China analyzed data on 7,410 babies born to the couple in three reproductive medicine centers in jiangsu province between 2001 and 2015.

The authors suggest that a similar increase in paternal age (over 32 years) was associated with the increase in the number of baby girls born.

They found that the blastocyst embryo transfer raised the probability of a baby boy born on the same day as the embryo transfer (when the embryo was transplanted to the mother during the third day of development).

The authors suggest that the reason for this may be the rapid growth of male embryos, and the abnormal loss of X chromosome in female embryos if the embryo is nurtured for too long.

They also found that the ICSI led to an increase in the number of baby girls.

Birth type (single-child/twin) and secondary sex ratio (SSR).

IVF represents in vitro fertilization, and ICSI represents the intramolecular injection of oocyte cytoplasm, the CE represents the embryo of the cleavage stage, and is the embryo of the blastocyst.

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