“…In recent years, based on evidence that in the first years of life the immune system is immature and partially unable to defend against infectious agents [ 18 ], the use of immunotherapy, i.e., measures that are able to stimulate and/or regulate the activity of some components of the immune system, thereby making host defenses more efficient, has been advocated [ 19 , 20 ]. Moreover, attempts to use vitamins [ 21 , 22 , 23 ], probiotics [ 24 , 25 , 26 , 27 ], oligo-elements [ 27 ], and complementary and alternative medicine [ 28 , 29 ] have been made. Unfortunately, the real benefits offered by some treatments are dubious, and they should be avoided until supported by evidence.…”