4】 "His smile is like an infant's"- Whose smile is referred to here? Why is it compared to that of'on in fant'? Who has nature treated him?

In the verse 'Asleep In The Valley',the smile of the Dead soldier is referred to.
            It is compared to the smile of an infanet suggests that the soldier innocent. The young people do not really know why the work takes place what they are sent to battlefield on death just to save the other countrymen. War is a huge tragedy to the young generation of all the nations in volved.
             It seens that natural treated him kindly it has given a pillow of ferns,soft underground to lie on,flowers,mountain streaes and sunlight. Insects are there to accompany him.