Jagged0
🇺🇦 سيف الإسلام
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Several demographic studies in countries like United States, Germany, and Japan have observed that:
Researchers think it may be related to early-life environmental factors, such as:
- People born in October–December tend to have slightly higher life expectancy.
- Those born in April–June sometimes show slightly shorter average lifespans.
Researchers think it may be related to early-life environmental factors, such as:
- Seasonal nutrition during pregnancy
- Historically, food availability varied by season.
- Exposure to infections
- Winter vs. summer disease exposure during infancy may influence long-term health.
- Vitamin D exposure
- Sunlight levels during pregnancy may affect fetal development.
- School entry cutoffs (indirect effect)
- In some countries, children born later in the year are younger in their class, which can affect stress, sports participation, and long-term socioeconomic outcomes.