Question: When was the first 16 and pregnant aired?
Disambiguated questions and answers: question: When was the first episode of 16 and pregnant aired?
Over what time span was the first season of 16 and pregnant aired?
answer: June 11, 2009
June 11, 2009 - July 16, 2009
Natural Questions answer: June 11 , 2009 (from the Wikipedia article "List of 16 and Pregnant episodes")