He thought that birth order had an affect on personality. For instance if you are the oldest child you are your Mother's first.
As such she was more likely to have approached your child rearing with more organization and scheduling.
Which is supposed to mean oldest/first born children tend to be more organized and responsible.
Or so the thinking goes....but there doesn't seem to be a lot of evidence to support this given all the variability.
For instance while my older brother (first born) is highly organized and responsible, I bet we can all point to an eldest child who isn't.
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