Oh, Celly…

@Align  

 
No, they are different types of responses for the question given. BG Pony #777E provided what kind of types is for each response.

@LastOfLancas  
What’s the text in the corner of each? Names?

Here’s a very rough translation. Please don’t be afraid to fix any grammatical mistakes:
 
Rarity: First, you must find your slave prince. He must have a stable job, is in a high social class, have planned excellent retirement plan, is earning high yearly income, and must be a utmost, first-class gentleman, and…
 
Rainbow Dash: The pigeons deliver them, of course. How pathetic. You didn’t know that?
 
Fluttershy: Pigeons? I thought it was storks?
 
Discord: Pigeons, LOLOLOLOLOLOLOLOLOLOL SRSLY? LOLOLOLOLOLOLOLOLOLOL
 
Zecora: Babies come from mating or copulation: an act between two ponies in passion.
 
Twilight Sparkle: Can’t find those words in a dictionary.
 
Maud Pie: I don’t know.
 
Pinkamena Diane Pie: Maybe, we didn’t even exist in the first place.
 
Fausticorn: I’ll leave it to your imagination.
 
Thanks BG pony #777E for Pinkamena one.

@Conred  

 
Well, Zecora also said babies come from mating and copulation, so Celestia is not the only one who gives a direct answer (not concise or simple, yes, but direct nonetheless).
 
Maud said “I don’t know.”
 
Actually, let’s translate the reactions within the panels:  

also let me guess  
Maud said “rocks”

@Yoga is boring  
i think all of them are exmplaining how babies are made and only Celestia seem to know the direct answer

?

What is Celestia saying? What is everyone saying?