Why are many Chief Executive Officers born under the signs of the Ram and the Bull? Don't look to the stars for answers -- look at the cut-off dates for grade school admission. A new study suggest that children born in March are much more likely to be CEOs than children born later in the year.

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Summer babies are less likely to be CEOs, says UBC study

Halloween is a fun time for Alix Rodrigues and her daughter Tian. Tian turns five next month which means she could have gone to kindergarten this year. But since she has a late birthday, her parents opted to wait one more year.

There's a growing body of research that may give Alix Rodrigues some comfort that she and her husband have made the right decision. The latest is an examination of birthdates of American CEO's, which shows that kids with later birthdays are less likely to rise to the top of the corporate ladder.

Maurice Levi is a Professor of Finance at the Sauder School of Business at the University of British Columbia in Vancouver. He co-authored the study.

Summer babies are less likely to be CEOs, says UBC study

In his book Outliers, Malcolm Gladwell noted the little edge that some older kids get in the early grades. And how it's an edge that just keeps growing.

This "cumulative advantage" has some parents going pretty far to give their children a better shot at success --- some, even starting from conception. We heard from Jennifer Drew lives in Ottawa. Her children are now 10 and 13.

But before we all start scheduling pregnancies to get a leg up on the school or hockey season, our next guest is here to give us some perspective.

Elizabeth Morley is the Principal of the Dr. Eric Jackman Institute of Child Study Laboratory School, an independent nursery to grade six school that is part of the University of Toronto. She was in our Toronto studio.

This segment was produced by The Current's Liz Hoath, Shannon Higgins and Sujata Berry.

Other segments from today's show:

Tyler Hamilton on cycling and cheating

Jerusalem: A Cookbook