When and in which country? Infantry, right? Generally, a squad is the smallest organized unit, and a platoon is 3 or 4 squads.
When I was in the US Army, a squad was 10 soldiers. It occasionally maneuvered as two fire teams, so that could be a smaller unit, but only some of the time. Today a squad has around 6 soldiers.
The number of squads in a platoon has varied more often, but the US Army hasn't gone outside the range of 3 to 4 for am infantry platoon.
A company is made of 3 or 4 platoons, one of which is a 'heavy weapons' platoon that has the mortars and heavy machineguns.
That already went past your question, so I'll quit.
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