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Key Facts In This Video
If you were born in the summer, research suggests you're more likely to be a smoker or shortsighted. 00:34
Increased exposure to sunlight in women who get pregnant in the summer may raise the likelihood of left-handedness and schizophrenia in their children. 01:22
The seasonal birth effect is only visible when looking at large populations, and no causal links between birth dates and characteristics have yet been found. 02:43