Terry O Connor , Dec 11, 2008; 03:03 p.m.
You need to be in Aperture priority with the largest aperture (smallest number) you can get for the focal length youre using.
So youre going to want to stay away from the likes of f22 and select f4 or f2 ...or whatever the lowest number is that you can get ....
So assuming youre at about 35mm select the widest aperture you can..thats prob about F4 or so....lock focus on your childs eyes..frame the pic an click away..
This will give you a nice narrow field of focus and should blur the wall behind.
Check out this website....select your camera and various settings and it'll tell you what the depth of field will be