Your baby's gender is determined at the moment of conception – when the sperm contributed a Y chromosome, which creates a boy, or an X chromosome, which creates a girl. Boys' and girls' genitals develop along the same path with no outward sign of gender until about nine weeks.
In the womb boys grow faster than girls and are therefore at greater risk of becoming undernourished. Fetal undernutrition leads to small size at birth and cardiovascular disorders, including hypertension, in later life.
Geneticists have discovered that all human embryos start life as females, as do all embryos of mammals. About the 2nd month the fetal tests elaborate enough androgens to offset the maternal estrogens and maleness develops.
Just four weeks after conception, the neural tube along your baby's back is closing. The baby's brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form. Structures necessary to the formation of the eyes and ears develop.
Biological sex in healthy humans is determined by the presence of the sex chromosomes in the genetic code: two X chromosomes (XX) makes a girl, whereas an X and a Y chromosome (XY) makes a boy. In this way, it is the presence or absence of the Y chromosome in a healthy human that differentiates boy from girl.
Sexual positions
Deep penetration, for example doggy style, means the male sperm that can swim faster start their race closer to the cervix and are more likely to reach the egg first, resulting in a boy. To try and conceive a girl, Shettles suggested avoiding deep penetration, favouring the missionary position.
Nervous system.
This is one of the first things to develop. It includes the formation of your baby's brain, spinal cord, and nerves.
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Although the brainstem is the first part of the brain to develop, the higher parts are evolving simultaneously but at different rates. The cerebral cortex – the part of the brain that controls thought, feeling, language and the senses – is the last to mature and begins functioning shortly before a baby is born.
There is a common myth among parents that boys tend to develop slower than girls. But is it true? Generally speaking, the answer is no. While girls and boys might develop certain skills on different timelines, the differences likely are not because of gender alone.
All human individuals—whether they have an XX, an XY, or an atypical sex chromosome combination—begin development from the same starting point. During early development the gonads of the fetus remain undifferentiated; that is, all fetal genitalia are the same and are phenotypically female.
They found that the most fertile months for conceiving a boy were from September to November, while the lowest fertile period was from March to May.
It is already known that there are metabolic differences between male and female embryos – male embryos develop faster than female embryos, for example. These differences are probably down to the action of proteins coded for by DNA on the sex chromosomes.
On average, baby girls are a month ahead of boys in the number of words they understand . This may be because newborn girls are more developed on the side of the brain that's responsible for speech and language . However, the way we learn to talk is complex, and all babies will develop at different speeds.
When mothers gained 20 lb, roughly 49% of babies born were boys. But when mothers gained 40 lb, the likelihood of having a boy increased, with about 52.5% of babies born being males. And at 60 lb gained, about 54% of babies were boys.
At the moment the sperm cell of the human male meets the ovum of the female and the union results in a fertilized ovum (zygote), a new life has begun.... The term embryo covers the several stages of early development from conception to the ninth or tenth week of life."
For instance, we can regard the fetus which is 20 weeks or more as a person. Alternatively, we can refer to a fetus of 12 weeks or more as human being.
Not only is sperm safe, but there may be some benefits to having sex and contact with sperm before and during pregnancy: Sperm and vaginal sex can help induce labor when the time comes. Oxytocin, one of the key hormones involved in progressing labor, is released during sex, and orgasms mimic contractions.
Eat healthy
Omega 3 fatty acids are absolutely essential for baby's brain development. Make certain you include foods that have a good content of omega 3, such as, fish, soybeans and spinach, in your diet. Also, iron found in leafy vegetables, like spinach, helps the flow of oxygen to the baby's brain cells.
So what does a baby look like at 8 weeks? Baby's arms, legs, fingers and toes are all becoming more defined, and baby is less curled up, so you can see their constant little twitches and bounces. There is now an identifiable nose and upper lip, and wee little eyelids and ears. There's a lot happening!
By 7 weeks, the embryo has grown to about 10mm long from head to bottom. This measurement is called the crown-rump length. The brain is growing rapidly and this results in the head growing faster than the rest of the body. The embryo has a large forehead, and the eyes and ears continue to develop.
Dr Michael Thomas MD (fertility specialist) actually advises that there are no methods to affect the sex of your child, including sexual position.
My general response is that it's a 50/50 chance that a woman will have a boy or a girl. But that's not exactly true – there's actually a slight bias toward male births. The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO).
Timing of intercourse
The timing of when a couple has sex is thought to actually make a difference in helping to conceive with a boy. It is one of the strategies suggested in The Shettles Method, which claims that the chances of having a boy are boosted when conception occurs as close to ovulation as possible.