Smart Diaper will send you phone alerts when babies need changing

Parents will quickly recognise when a nappy needs to be changed — before the crying begins.

Penn State University researchers developed a “smart nappy with a built-in sensor that sends an alert to a phone if it gets wet.

The nappy is made of pre-treated paper with sodium chloride (salt) and has an outline of a circuit board on it that is traced over with a pencil to transfer graphite to the surface, as well as a tiny lithium battery attached.

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The “smart diaper” was created by embedding four sensors between the layers of a diaper, as detailed in the journal Nano Letters.

When the nappy becomes wet, the graphite reacts with the liquid and sodium chloride, and electrons flow to the graphite, triggering a sensor.