Some researches found that children born via C-section and/or fed with formula milk may be deprived of friendly good bacteria from the very beginning of their lives. A baby who is delivered through natural childbirth gets almost all of the vital gut bacteria from his or her mom, and the first stage of ‘friendly’ bacteria colonization will influence the baby’s gastrointestinal dynamic throughout his or her entire life. 
Consider giving children (above 2 years old) who was born via C-section more high quality friendly bacteria. It may help improve their immunity, gut health and reduce chances of getting allergies and infections.