We all love a tale of bravery and heroism, especially when it's based on a true story. Very few films tick those boxes in the same way that "American Sniper" does, and Bradley Cooper's performance as former Navy SEAL Chris Kyle is just phenomenal. This is a tale of real grit, real determination, real courage...and a fake baby.
The baby in this scene is, very obviously, a doll. There's not even been any attempt made to hide it. Apparently, the real life baby that was due to be in the scene was taken ill, and there was no time to find a replacement, so they had to improvise. We're not convinced. Surely in the time it takes to go to a shop and buy a toy doll, you could phone a few people and find a baby to borrow for a few minutes?