Reliability. This is a tough one, as it requires long-term knowledge of system reliability, through thick and thin. There are many baby monitors on the market that start out excellent but tend to glitch out or completely fail within the first several months of ownership. This is especially the case for many unrecognized brand names that are saturating the market. If you're buying this as a baby registry gift the last thing you want to do is make the new parents think you cheaped out on a junky baby monitor! All of the best video monitors that make it onto our list have withstood the test of time, lasting at least 6 months, and in some cases several years at this point (like the Infant Optics option!). Another point about reliability that's worth mentioning is that most modern wifi baby monitors will keep a local connection to your app even when the internet is down. So as long as you're still in your house, you can continue streaming video even when the internet is down.
The VTech DM221 audio monitor is the best choice in the category—it's consistently a best seller at multiple retailers, with thousands of positive customer reviews. Losing video is a major sacrifice, of course, but we could see this monitor being a good choice for parents of toddlers who are considering replacing a failing monitor, or people who want a monitor only so they can hear their kid crying out from a distant bedroom.
Many parents find that a basic sound product more than meets their needs. They plan to run to baby's aid each time they hear them cry, and they don't need to spy on their baby with video. Using a sound option is the cheapest way to go to get a quality product that works well. However, if you need or want to see your baby, then a video option is the only way to meet this need. Choosing a Wi-Fi option means no concerns about range, the ability to see your baby when you are away from home, and usually better image quality. Wi-Fi also means you'll be able to use it for longer as potential security or nanny cam; this adds value you may not be considering right now (but should). Movement monitoring options are a luxury that most parents can do without. If you're worried about your little one and SIDs, studies show that having a baby sleep in their own bed in your room (along with standard safe sleep practices) goes a long way in helping to prevent SIDs and could potentially be more effective than movement monitoring. Choosing a great beside bassinet may be a better solution than a movement product. However, if your heart wants a movement product, then be sure to consider a sound or video option to pair with it so you can be sure to hear the alarm from another room.
Environmental sensors: Many monitors include the ability to set thresholds and upper limits for room temperature and/or humidity, and they'll alert you when these ranges are exceeded. While they can't control the temperature or the amount of moisture in the room's air, this feature can help you improve your child’s comfort, which will help them get more restful sleep.