Q: We have 3 children, they are all boys, and we now want one more child. Should we give up our hope for a girl?
A: also after 3 kids of the same sex, your opportunities in the following pregnancy having actually the very same one is about even. Having already 3 guys you might think it’s a foregone conclusion that the next baby is going come be one more boy, but in reality, your chances are about equal between a boy and a girl. It’s no that unusual to have 3 youngsters of the same sex in a row. This actually happens in one the end of four couples who have 3 children.
You are watching: What is the probability of having four girls in a row?
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Even ~ 3 children of the very same sex, your opportunities in the next pregnancy having actually the exact same one is about even.
How the baby’s gender is determined
Each the the masculine sperms and also each egg carry 23 chromosomes. The sperm and also the egg integrate at fertilization for a complete of 46 chromosomes which come in 23 pairs.The 23rd chromosome is dubbed the “sexchromosome”. In sperms, the is one of two people an X or a Ychromosome, if in the woman’s egg that is constantly X.If an Xbearing sperm fertilizes the egg, the result 23rd pair is XX, a girl, and if a Ybearing sperm fertilizes the egg, the an outcome is XY, a boy.It is therefore the sperm the decides the baby’s gender: Xbearing sperms an outcome in girls, and Ybearing sperms in boys.In general, X and Ybearing sperms are about equally spread in the ejaculate, so every time there is about an equal 5050 chance for each gender.If you already have a boy, the chance that the next baby is additionally a young is 50 percent
It’s all a matter of mathematics. A couple having 4 youngsters of the same gender in a heat happens actually an ext often than you might think. In fact, one in eight couples (12.5%) v 4 youngsters have 4 that the very same sex.
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Here"s just how it goes:
Couples through 2 children: 50% that couples have 2 girls or 2 boys, and 50% the couples have actually 1 girl/1 boyCouples through 3 children: 25% that couples have actually 3 girl or 3 boys, and 75% have 1 boy/2 girls or 1 girl/2 boysCouples through 4 children: 12.5% the couples have actually 4 girls or 4 boys, 37.5% will have 1/3 and 50% will have actually 2/2.Couples with 5 children: 6.25% have actually 5 the same sex and in couples with 6 children, 3.125% will have the very same sex.
 All very same sex  Different sexes 

2 children  50% G/B  50% B/G 

3 children  25% all girl or every boys  75% BB/G or GG/B 

4 children  12.5% all girls or all boys  37.5% 1B/3G or 1G/3B  50% BB/GG 
5 children  6.25% all guys or all girls  25% BBBB/G or GGGG/B  68.75% GGG/BB or BBB/GG 
6 children  3.125% all boys or all girls  12.5% BBBBB/G or GGGGG/B  46.875%: GGGG/BB or BBBB/GG 




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