Does the air cell get bigger during incubation even if there's no baby

[Farm Frenzy]

I was just wondering because I got 2 BR eggs from my own girls in my incubator, but they are so dark brown it's real hard to see into them when I candle. BUT, I can see that the air cell is getting larger everyday. Does that mean there is a baby inside possibly?

 

[horsejody]

I think evaporation causes the air cell to enlarge. However, if you can't get a good look by candling, I would assume that they may be alive. Better safe than sorry.

 

[Farm Frenzy]

That's what I was thinking too. I can't see veins or anything, but it's because the shells are so dark. My EE egg that's in there with them I can barely see the veins. But I figure if one is developing, then hopefully the others are too.