The most accurate way to know if you're having a boy or girl is an ultrasound, often done at around 20 weeks.
Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).
Nature is designed to favour the conception of boys from September to November and girls from March to May because of an evolutionary mechanism aimed at keeping the overall sex ratio as near to 50:50 as possible, the scientists said.
The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO). This means about 51% of deliveries result in a baby boy.
A recent study suggests that carrying a male or female foetus could lead to different immune responses in pregnant women. Pregnant women carrying girls have a greater chance of experiencing nausea and fatigue, according to the results of a study from the USA's Ohio State University Wexner Medical Center.
One myth suggests that pregnant women who do not experience mood swings are carrying boys, while those who do experience noticeable changes in mood are carrying girls. The truth is that most women will have mood swings during pregnancy, especially during the first and third trimesters.
01/11Age and male fertility
However, the number and quality of the sperm declines with your age. From a biological standpoint, experts recommend a man is best suited to fatherhood from his late 20s to early 30s. It is still possible for men to father a child in their 50s and older.
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.
#1: They love their mamas
As his mother, you will be his favourite person in the world. He will be loving, kind and affectionate towards you. People often imagine girls to be the gentler of the sexes, but in fact boys can be ever so affectionate towards their mothers.
The nipples and the area around the nipples (areola) become darker and larger. Small bumps may appear on the areola. These bumps will go away after you have your baby. You may notice a yellowish discharge, called colostrum, from your nipples as early as the 16th to 19th week.
Your nipples may start to darken in color, become more erect and be extremely sensitive. These symptoms are due to increasing amount of HCG hormone that begins at implantation.
You may not start showing in your first trimester because your body is going through changes during this time. Your baby is still forming inside of you. While you may feel different, your body may not look different. Typically, your bump becomes noticeable during your second trimester.
Women carrying a male fetus have significantly increased maternal weight gain during pregnancy when compared to women with a female fetus. The increased sex ratio remains when adjusting for each newborn weight group.
Boys' and girls' genitals develop along the same path with no outward sign of gender until about nine weeks. It's at that point that the genital tubercle begins to develop into a penis or clitoris. However, it's not until 14 or 15 weeks that you can clearly begin to see the differentiated genitalia.
During the third or last trimester, some women experience water retention in their face, and this leads to swelling of the nose.
There are also both personal and environmental factors that affect the average sex ratio. The chance of having a boy appears to decline with the mother's age, the father's age and the number of children the family already has.
The rarest birthday of the 365 annual calendar days is Christmas day, Dec. 25. If your birthday is New Year's Day or Christmas Eve, you also have uncommon birthdays. Jan. 1 and Dec. 24 are just below Christmas on the list.
The most common birthday in Australia is September 17th! The least common birthday (you may have guessed it is) is Christmas Day, the 25th of December. If you are inclined to count leap years in the mix then the 29th February is the least common birthday, but only because they occur once every 4 years.
First, which month has the least birthdays? The data comes from the Centers for Disease Control and Prevention and the Social Security Administration. The rarest month to be born in is February, making Aquarius the rarest zodiac sign. February is the shortest month of the year, even with a leap year.
Speed: since sperm containing the Y chromosome are faster than those containing the X chromosome, if the egg is in the fallopian tube at the time of intercourse, there is a greater probability of a Y sperm reaching and fertilising it, which means there is a greater probability of the baby being a boy.
Research over hundreds of years has consistently found that boys naturally outnumber girls at birth.