The problem here is that most people who buy baby monitors plan on using them in their home, and most people don't do top secret stuff in their home - they reserve that for their corporate office or government agency type stuff.
I also wouldn't recommend wireless security cameras either because they're seen as a low cost alternative to wired, mostly used in public places where people wouldn't normally discuss trade secrets. Most high security organizations don't use wireless security cameras because they are trivial to jam with off-the-shelf equipment.
Even if your WiFi network itself is secure, many wireless cameras allow people to login over the Internet (Internet of Things), and figuring out how to change the default passwords and picking a secure one might be too much effort if the included software is hard to use, and that's assuming the website doesn't have vulnerabilities or worse - allows the company itself to spy on you (if it was designed by one in China).
A wired one isn't much effort to setup anyway since the computer is in the same room.
Therefore, I wouldn't recommend any baby monitor or wireless security camera (except maybe a hypothetical one made by Apple or Google) if I had millions of dollars at stake here. Furthermore, the two options below allow you to access the baby monitor anywhere you have Internet access.
Connect a security camera with night vision I recommend this one via USB or Ethernet to a computer in the room, configured to automatically answer video calls How to do it in Skype from your phone, tablet, or laptop.
If you don't have a spare computer in the baby room, you can get an old Thinkpad running Windows 10 - $154 on eBay. I picked a laptop because a typical desktop would cost $84/year in electricity if it's on 24/7, while a laptop might cost only $15/year.
If you want the baby to see you, you can put an external monitor next to the baby (preferably bolted or taped down so it can't fall on the baby). If you need a longer USB cable (unlikely), here's an active cable
IMHO, this setup is best because it has night vision - great when the baby's sleeping.
It also gives you the ability to record your baby on multi-terabyte external hard drives via screen recording software so you can share video and pics of the baby with your friends or on social media. (Note that I'm not familiar with setting up screen recording software to automatically record when there's movement though.)
If you don't need night vision or recording, you can use a smartphone configured to automatically accept video calls. I recommend a Nexus because they can immediately get Android security updates and Skype might not always wake up an iPhone (which would require it to be always on). You can also get an older model for cheap
Remember to keep it plugged into a charger.
If you're having problems with WiFi speed or range, I recommend an ASUS RT-88u or an ASUS RT-68u as they have 100+ feet of range
For the wireless network, keep in mind that an attacker can guess 100,000 WPA2 passwords per second on an AMD 5970 (a $600 gpu released in late 2009), so I'd use a 12+ character randomly generated password generated with LastPass or 1Password (or this tool.
Because you should only need to type the password once per device connected, a hard to remember password shouldn't be a problem (I'd write it down in your password manager or in a computer somewhere)
I recommend putting the wireless cameras on a separate network so you don't have to give visitors to your home the password to that network (if their equipment gets hacked, a hacker could know your WiFi password). ASUS routers can host separate networks on the same router.
Important: If you're going to connect to the baby monitor on an open WiFi network or are using it on a cellular network (stingray attacks) a VPN is required. I recommend ExpressVPN since it's probably the fastest, with PureVPN in second place.
Now, if you think someone's motivated enough to camp outside your house for the duration of the eavesdropping, laser microphones pose a real threat, and I'd get something to block the outside of my windows and put up a fence around my property so people can't put in a bug very easily, and hire 24/7 security guards. Of course, most people worried about those types of attacks also have their private conversations in interior rooms, use special sound blocking foam on the walls, and try to live in neighborhoods where a car parked on the street would be abnormal.