Rock climbers have long hailed the beloved carabiner, a tool unmatched in versatility. But did you know that it's also a baby registry staple? About 10 years ago, some marketing genius took the ubiquitous metal clip and rebranded it with a terrible name: The Mommy Hook. What it is: Uh, still just a large carabiner clip. What it can do for parents: So much, actually! If you have one of these things - whether you choose to call it by its mummy-fied name or not - here are some ways to use it to make your life a little bit easier.