The company uses a series of algorithms to cross check personal data such as name, date of birth and voter registered address against publicly held data such as the birth registry, voter lists and passport details.

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However neither proactively publishes the data on month of birth, which we therefore obtained through requests under the Freedom of Information Act.

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Medical-related institutions hosting data, such as date of birth information, social security numbers and medical records, are also higher risk.

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According to the Scandinavian data, the standard chance of giving birth to a girl is 49%.

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Credit-card companies use the software to spot recidivists applying for new cards under modified names. (Names are cross-referenced with addresses, dates of birth and other data.) Developers and users are hesitant to discuss costs.

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In the latest study, the team used data from a group of children followed from birth.

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Forum data showed that the proportion of infants born with low birth weight was 8 percent in 1997, the highest figure in more than 20 years.

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But Kamrava achieved a live birth 10 percent of the time, according to CDC data for his clinic.

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Nationally, when doctors implant embryos, they manage to achieve a live birth 38.7 percent of the time, according to the CDC data.

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All the rest of the breached data, including phone numbers, passwords, email addresses, usernames, birth dates and account histories, was left unencrypted and vulnerable.

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