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The chances for a boy or a girl are a lot like the chances of getting heads. And if they decide to have another child, the chances are that the baby will be a girl versus a boy. There are many more examples of this in nature, and a lot of it depends on survival of the species. Perhaps women who tend to eat cereal have other shared qualities and it's one of these that affects whether they'll have a boy or not. As a result we set out to find out whether a preference occurs and at what age it develops.

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The paper, which is published in the journal of Infant and Child Developmentshows that in a familiar nursery environment significant sex differences were evident at an earlier age than gendered identity is usually demonstrated.

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Infants prefer toys typed to their gender, says study

Then we'll explore why we see differences in the numbers of girls and boys in many families. Many reptiles also have sex ratios that depend on the environment. For us the sex of the child is mostly determined by which of dad's sperm makes it to the egg first. Animals with Wacky Sex Ratios Based on a number of factors, some animals alter the sex ratio of their offspring. When we studied toy preference in a familiar nursery setting with parents absent, the differences we saw were consistent with these aptitudes.

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