Scientists finally know why people get more colds and flu in winter | CNN

[rcjordan]

Why colds and flu viruses are more common in winter

https://www.cnn.com/2022/12/06/health/why-winter-colds-flu-wellness/index.html

So, Rumbas, putting the babies outside to nap (DK, RU, others?) probably increases their developing immune system cells in their nose.