IT seems that we have more in common with our distant reptilian relatives/ancestors than I thought. This from Discovery:

Dinosaurs probably did not enjoy many carefree teenage years, since most were parents before they reached adulthood, according to recently announced research.The find puts dinosaurs on the list of animals that had teenage pregnancies. Others on the list include crocodiles, lizards and humans.

And, they did it for to ensure large numbers of future generations.

“If these species had waited until full size to reproduce, they would have had very few years in which to produce offspring.”

I wonder if dinasaur parents hired dinosaur private eyes to keep a watch on their dinosaur kids….