Baby, the four corners of the picture are dark. What is the reason?

1. You used the wide-angle end of the camera, and you took it very close. At this time, the angle drop of the wide-angle lens is more serious, which is natural and cannot be considered as a problem.

2. If the baby you are talking about is something, then what you are shooting is relatively small, and it is normal to shoot at the macro.

The room is very dark, with only a small piece of light, bright in the middle and dark in the corner.

4. Flash photography, this time it must be brighter in the middle and darker in the corners. You can find ways to make the light of the flash scatter more severely, such as soft mask, and the effect will be better.

I have probably thought about these projects. Your situation is not clear enough to elaborate.