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It takes 4 years to go through medical school. Within these 4 yrs, you acquire the knowledge of the human body including the diseases and their traetment/workup. It is a long process but well worth it---you will be saving human lives.
Since you are very passionate about children, you might want to look into becoming a pediatrician or a child psychologist, or a teacher. There are many opportunities out there that will enable you work around kids.