With all the best practice in the world, especially working with kids, a little retouching in post production is sometimes necessary.
The first instance was a shot I took during a wedding job. The Mum was standing in the background as the baby was only just crawling. I felt that the image would look a lot cleaner without them, so I removed her legs for the final print.
The second example was another wedding job I worked on that involved a photo montage of all the wedding guests. I needed a full body shot of each guest to be able to do create a seamless final piece. This guests dance move had caused him to slip out of the frame, but I was able to build the left hand side of his body.