[ANSWERED] Some young children have trouble producing [s] and [z]; they substitute [?] and [ð] for these…

Some young children have trouble producing [s] and [z]; they
substitute [θ] and [ð] for these sounds. Thus, the word Sue would be
pronounced [θu] and zoo as [ðu]. Compare the two articulations and see
whether you might be able to describe to a child of age 6 what he or she would
have to do to change the articulation from [θ] and [ð] to [s] to [z].