Bellabeat is the company that makes an iPhone enabled fetal heart-rate monitor. They just updated their iOS app on Thursday to include a new feature to help expectant mothers track changes in their mental health and to keep an eye out on 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. The app will use sound waves to find the baby's heartbeat while the accompanying Bellabeat app records the audio.

It will track heartbeats per minute and gives the users tools to track other important stats, from how many times a baby kicks or how its weight changes over time.

One winning feature of it is to track the changes of moods and feelings throughout pregnancy by recording notes within the app. Once a month, users will be asked to answer two questions about their feelings and moods overall, and create a pattern out of it.

If it suggests early signs of depression, the app encourages the user to seek help from their healthcare providers.

Bellabeat, a Y Combinator-backed startup, first launched its $129 heart rate monitor in the United States in February after launching in Europe last fall.

The latest update is only available to the app's iOS users.