Baby

Babies are what humans call their young. In general, human offspring are referred to as babies from birth to about when they start to walk. According to the Eleventh Doctor, babies had their own language, which he could speak.

The fleshkind baby, Sky Smith, was primed to rapidly age into a pre-teen upon encounter with the metalkind. (SJA: Sky)

Babies encountered by the Doctor

 * Audrey Dudman (DW: The Curse of Fenric)
 * Ace (ST: Ace of Hearts)
 * Rose Tyler (DW: Father's Day)
 * Melody Pond (DW: A Good Man Goes to War)
 * Alfie Owens (DW: Closing Time)