The Empty Child and The Doctor Dances
the answer to that question is Doctor Who The next doctor
That would be "The Name of the Doctor".
The episode is called Logopolis and is also the first appearance of Peter Davison (the fifth Doctor).
A Doctor Who treats children is called a paediatrician
The 13th episode in the 4th series of Doctor Who is called 'Journey's End'.
None of the Doctor's (real) children have ever been seen onscreen, or mentioned by name. The Doctor originally travelled with his granddaughter, Susan. In the 2008 episode 'The Doctor's Daughter' aliens steal some of the Doctor's DNA and use it to create a clone named Jenny who regards the Doctor as a father as she was created from him.
A children's doctor is called a pediatrician.
It Is Called T.A.R.D.I.S
It was called 'the Daleks'
Yes, David Tennant did appear in the 50th anniversary episode of Doctor Who, called The Day of the Doctor.
"The Unearthly Child" was the first named episode, there was a pilot episode before it.
The first episode of series 5 is called The Eleventh Hour.