The Medela Swing electric breast pump is a really popular choice with new mums; we asked mothers to tell us how satisfied they were with it, and put it through tough tests.

The Medela Swing is a mini-electric breast pump that pumps one side at a time. Like a manual pump, it's suitable for occasional use; unlike a manual, it runs on a power cord or batteries. It operates with two phases of expression that are supposed to...