I have begrudgingly gotten our kids apple watches for exactly reasons outlined I am in some latent way, however, concerned with the idea of them wearing a cellular radio directly on their skin all day - I have for the most part avoided any of the EMF/4G/5G handwaving but would love an informed opinion from HN if there is any reason for concern / need to moderate or otherwise?
at 2.4 GHz, the wavelength is ~12.5 cm, which isn't going to do anything to anything protein-scale in your body.
Clinical evidence hasn't shown any association between negative health effects and EMF in that spectrum.
The preponderance of conspiracy theory around 5G says more about psychology than physiology.