Bellabeat, the company behind the iPhone-enabled fetal heart-rate monitor, updated its iOS app on Thursday.

The latest version includes a new feature to help expectant mothers track changes in their mental health, in addition to the tools for keeping tabs on their own physical health and their baby's development.

Bellabeat's Connected System allows pregnant women to listen to their children's heartbeats through a device that connects to a smartphone with an audio cable. It uses sound waves to find the baby's heartbeat while the accompanying Bellabeat app records the audio.

The app tracks heartbeats per minute and gives users tools to track other important stats, like the number of times a baby kicks or how its weight changes over time.

The new mood-tracking feature is meant to help pregnant women recognize early symptoms of depression, said Bellabeat cofounder Urška Sršen.

"Depression disorders during pregnancy, which are very common, can lead to other health complications for the mother and the baby," Sršen said in an interview with Mashable. "We decided to add this mood tracker to encourage women to keep notes on their mood day by day so they can recognize these symptoms quite early on."

Via Mashables