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Finland swaps playground plastic for mud and soil and kids immunity improves fast
Science
Published on 28 April 2026
Immune cells shifted after weeks outdoors in soil
Finland’s daycare rewilding experiment replaced artificial playground surfaces with soil, plants, and forest-floor materials to create biodiverse outdoor habitats. Researchers found children who played in these natural settings developed stronger immune responses, including fewer pathogens and more immune-regulating T cells. The findings suggest early exposure to microbes may help train immunity.
- Daycare playgrounds were rewilded with soil, plants, and forest-floor materials
- Children showed reduced pathogens in the natural play setting
- Immune-regulating T cells increased compared with traditional playgrounds
- Early microbial exposure may be key to stronger immunity
Read the full story at The Economic Times
This summarization was done by Beige for a story published on 
The Economic Times