The BlueSmart Mia Smart Baby Feeding System is a sleeve-and-app combo that slips onto most baby bottles to track the content’s temperature, your child’s feeding, and a host of other data, including alerts for milk expiration, meal times, and more. Once connected, the proprietary app monitors and records that data, which can be shared with your pediatrician on your next visit. For parents that are especially concerned with growth of undersized or premature infants — or anyone tired of logging feedings by hand — it’s an important tool.