WARNING: IT'S NOT THAT KIND OF STORY.
Sure, it deals with younger versions of The Doctor and company, but it won't be nothing like that! There won't be no baby talks, no diaper changes, and of course NO BREASTFEEDING. It will focus on growing up, both physically and mentally.

Inside the TARDIS, Twilight and her friends became fillies again, Spike becames a newborn dragon and the Doctor had go some past incarnations. Now he must find the way to turn everyone in their right age before it's too late.