Innocent & naive? You must be "wet behind" these
[DOC] [TLE] Callow | Definition of Callow by Merriam-Webster [PAR] You might not expect a relationship between callow and baldness, but that 
connection does ... juvenile, puerile, raw, unfledged, unformed, unripe, unripened
, wet behind the ears ... maidenly, virginal; ingenuous, innocent, naive (or nave), 
tender; unknowing, ...