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What is A 3 year old child can do all, except – and explain in detail?
Important milestones of a 3 years child

Rides tricycle                                                             
Stands momentarily on one foot.                           
Draws a circle.                                                            
Can dress or undress himself completely              
Builds tower of 10 cubes 
Knows his age and sex.      
Repeat a sentence of 6 syllables        
Has a vocabulary of 250 words.                 
Counts 3 objects correctly.    
Can withhold and postpone bowel movement.