Why do some families have all boys or all girls?

If your children are all boys or all girls, you may have wondered why you’re more likely to conceive one gender instead of the other, or whether it’s all just up to chance. Read on to find out the answers to these questions about the likelihood of having only sons or daughters:

• Can some men father only girls because they produce only X sperm, or only boys because they have only Y sperm?
• If you already have two or more children of the same gender, are the odds stacked that your next baby will also be the same gender?
• What are the statistical odds of having four, five, six, or even more boys or girls in a row? 

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