Pregnancy

Baby sex

The baby's sex is genetically determined. Everything is decided at the moment of conception when the woman's egg meets the man's spermatozoon .

Sexual chromosomes X or Y determine the sex of the baby. Since all the eggs carry the X chromosome, it is the spermatozoon - the carrier of the X chromosome or the Y chromosome - that is decisive.

During conception, the chromosomes, therefore the DNAs, of the two cells (ovum and spermatozoid) unite. The chromosomes, therefore the DNAs, of the two cells unite.

This is the 23rd pair of chromosomes that determines the sex of the baby:

  • XY for a boy. An X chromosome brought by the ovum of the mother, the Y chromosome brought by the spermatozoon of the man.
  • XX for a girl . An X chromosome brought by the ovum of the mother, the X chromosome brought by the spermatozoon of the man.

How does baby grow up in the belly?

How many weeks of pregnancy can you see baby's fingers? How much does it weigh in the 5th month? And when is he able to discern the flavors?
Test your knowledge!

Sexual differentiation

Then, during the development of the embryo, the organs will gradually be put in place. The external genitalia will differentiate progressively. It is generally towards the 15th-16th week of amenorrhea, that the sex of the fetus will be visible on the ultrasound.

The differentiation of the genitals is under the influence of fetal hormonal secretions, mainly under the influence - or not - of the male hormone secreted by the testicle in the future boy; and of course not secreted in the future girl.

At birth, in a very small percentage of babies, there are anomalies of genital development that will require the intervention of specialist pediatricians.

To see: ultrasounds during pregnancy in video

Throughout pregnancy, fetal development can be monitored by regular ultrasounds. Ultrasound is an examination that examines internal anatomy using high-frequency sound waves. Explanations in video ...

You want to react, to give your testimony or to ask a question? See you in our FORUMS Getting pregnant, Pregnancy or A doctor answers you !

Read also :

> All about fertilization
> In Vitro Fertilization (IVF)
> The best chances to get pregnant

Popular Posts

Category Pregnancy, Next Article

Miscarriage: The testimony of a woman - Pregnancy
Pregnancy

Miscarriage: The testimony of a woman

Testimony of Solange, 35, who tells why her miscarriage was painful ... You had a miscarriage at two months of pregnancy. It was your first child? Fortunately not. Because it has been very shocking for me already. And I already had my daughter who was five years old. I imagine ... when it's the first pregnancy, it must be horror
Read More
Pregnancy: forbidden foods ... and advised! - Pregnancy
Pregnancy

Pregnancy: forbidden foods ... and advised!

Being pregnant is not an illness, far from it! However, we can read everywhere that it is necessary to be careful, that during the pregnancy one can not eat anything anyhow, that there are some forbidden foods to avoid as far as possible, even at all. price ... Indeed, we hear about the risks of toxoplasmosis, listeriosis causing problems - certainly or possibly
Read More
Miscarriage: recurrent miscarriage - Pregnancy
Pregnancy

Miscarriage: recurrent miscarriage

As we have said, a miscarriage is, most often, a simple accident without consequence. Yet, some women repeat these natural abortions. We are talking about repeated miscarriages , starting from three miscarriages. It is then necessary to determine the cause of these repetitions. For this, the doctor will have to conduct an investigation: He will first look for a possible diabetes
Read More
How is milk made in the breasts?  : lactation - Pregnancy
Pregnancy

How is milk made in the breasts? : lactation

The lactation process depends on two hormones: prolactin and oxytocin. Both are activated by the baby's sucking. > Prolactin : this hormone is secreted after birth and causes the rise of milk. It triggers the manufacture of milk at the level of the alveoli of the breast, when the baby heads. Prolactin levels are higher at night, allowing nocturnal feedings
Read More