TL;DR: A Drexel University study dug into data from Portland, Oregon—tracking over 36,000 trees planted between 1990–2020—and found that mothers living within 100 meters of newly planted trees tend to have heavier, healthier babies. After controlling for factors like income, education and BMI, researchers saw each new tree bump birthweight by about 2.3 grams; hanging out near ten or more trees equated to a roughly 50-gram gain, plus lower risks of pre-term and small-for-gestational-age births.
What’s cool is that this goes beyond just big old parks: even new saplings make a difference, hinting that planting trees is a simple, low-cost public-health win. Established trees also helped buffer road-density effects (think less noise and pollution), and the team thinks part of the benefit comes from the stress-busting “soft fascination” of green surroundings. The authors call for randomized trials, but treating tree-planting as a natural experiment already makes a strong case that more greenery = healthier starts to life.
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