We live in a time when almost everything can be measured. Our heart rate. Our step count. Our sleep. Our stress levels. And now, our babies' sleep too. In just a few years, the market has become flooded with sensors, cameras, wearable devices and apps promising parents’ greater insight into their baby's sleep. These technologies can track movement, oxygen saturation, heart rate and sleep patterns, presenting everything as graphs, numbers and notifications directly on a smartphone. For many new parents, this sounds reassuring. Surely, if we know more, we'll be better equipped to keep our baby safe? But the question is whether more data necessarily brings greater peace of mind. In product design, there is a principle known as Quiet Tech. It describes technology that supports us without demanding our attention. Perhaps this is exactly the kind of technology tomorrow's families need most.