Will children who die, go to heaven or they'll go to another place?

Will children who die, go to the Jannah (heaven) or they'll go to another place? I have heard that children won't go to the heaven which Mo'menin will go (I mean the children who die before the age of puberty). In truth, they will go to another place which is not as fantastic as Jannah, but on the whole that is a good place and actually that is a better than this world. - My question is that firstly “is it a fact that they go to another place"? - Secondly if so, where is that place and what is its name? *(**Note**: I am looking for authentic hadith(s) regarding this matter)*