Paramount Syndication 8x10 B&W photo from the Star Trek: Deep Space Nine episode Sons And Daughters, aired the week of October 13, 1997.  You know, I used to think the rapid rate of Klingon growth was unrealistic and ridiculous.  Now I have a kid barely a head shorter than I am.  I think they nailed it.  More about the show here, more about the episode here.