This smart diaper will send a phone notification when baby needs a diaper change

A team of researchers from Penn State have developed ‘smart diapers’ with built-in sensors that notify parents when their baby needs to be changed.

The diaper is made out of paper that has been pre-treated 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 with a tiny lithium battery attached.

“Once the diaper gets wet, the graphite reacts with the liquid and sodium chloride and, as it’s absorbed by the paper, electrons will flow to the graphite to set off a sensor,” the description states.

It can even tell parents how moist the diaper is, which may help them decide whether it needs to be changed right away or not.