There are countless things that affect a baby's development in the womb. Seasonal viruses - particularly the flu - can affect maternal health and fetal development too. Gestation during wintertime, with its short days and long nights, can cause seasonal affective disorder (SAD) in mothers, with low serotonin levels in the maternal brain potentially leading to similar shortfalls in the baby.
This is why science says your personality depends on the season you were born in.
- Spring:
Congratulations, March, April and May babies, you score high on the hyperthymia scale - which is actually good. Hyperthymia is general optimism - the ability to see every down as a prelude to an up, every market crash as a run-up to a boom. But that comes at a price: spring babies are also more susceptible to the precise opposite of hyperthymia: clinical depression. Ground zero for the condition - according to a massive study of 58,000 subjects in the U.K. in 2012 - is among people born in May. November babies have the lowest depression rates.
- Summer:
It's mostly glad tidings for June, July and August babies. No SAD for you - at least nothing caused by the light levels after your birth, though there may be some impact from mom having carried you in December, January and February. Summer babies have some of the same hyperthymic characteristics as spring babies, but that can be offset by cyclothymia - rapid cycling between high and low moods. Still, that's probably not a warning sign of bipolar disorder; bipolar diagnoses are lowest among babies born in August.
- Fall:
For people who believe in astrology the general equanimity of fall babies seems to provide evidence that at least the sign of Libra - the well-balanced scales - has something going for it. It doesn't of course, but whether the cause is the bountiful nutrients available at harvest time, or the fact that the long nights and seasonal illness of winter have not yet descended, people born in fall not only enjoy low levels of depression, but are similarly less likely to develop bipolar disorder. The one glitch in the autumn-born: they do have a tendency to irritability.
- Winter:
Buckle up, babies, things could get rough. Among the challenges facing people with winter birthdates are higher levels of schizophrenia, bipolar disorder, SAD and depression. That's a nasty handful, but there are a few compensations: winter babies are less irritable than those born in fall. What's more, according to an admittedly small 2015 study of 300 celebrities, January and February are the right months to be born if you want to be famous since those months correlate with creativity and imaginative problem-solving.
None of this means that parents should try to time births for particular seasons. And none of it means that birth month is a remotely conclusive thing. There are plenty of cranky pessimists born in March and plenty of October babies whose scales are always out of balance. Ultimately, your personality is much less about the season you're born than the things you experience in all of the many seasons of life that follow.
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