Sentence 1: Amy had just purchased her preteen son new shoes in May. 
 Sentence 3: To her surprise the boy had outgrown the new shoes in 3 months 
 Sentence 4:  Amy purchased new shoes a half size larger than needed 
 Sentence 5:  She was happy when he was able to wear them for 8 months 
 Option 1: It was August and she noticed he was walking off again. 
 Option 2: He had small feet and would wear them a long time.