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If it's just to check up now and then, the simplest one you can find will do.

I actually found a wired one at the thrift store (that is kind of rare). Perhaps something like a baby crib monitor will do.

Fancy "critter cams" will have storage for X amount of time and wi-fi connections. My neighbor has one to see who's been cruising the grounds. Probably motion-activated.

I just avoid like crazy any camera (you know their names) that sends data off-site. Any data sent outside your home can and will be used against you by other people.

I read the tech news and in the past week or so, breaches have happened at Dicord, the UK foreign office, and the Northern Ireland Police ... described as "monumental"

There's a review of crib monitors here that should give you an idea of the options. Some use wi-fi, which could put you out of range. One uses a signal (like a little tv transmitter), and so on.

https://www.babylist.com/hello-baby/best-baby-monitor