Only one baby can use one BlueSmart mia. The device can only record feeding data of one baby. However, if you have more than one baby and more than one BlueSmart mia device, you can manage the feeding data of each baby in one BlueSmart mia app. To do so, you must create different baby profiles by tapping a plus sign on the right side of your baby's avatar on the profile page. The BlueSmart mia app's home page uses the feeding data of the selected baby (the avatar displayed on the top left corner of your smartphone screen).
If you have more than one baby you want to track with BlueSmart mia, you will need a separate BlueSmart mia for each baby.