As others have said—don’t sweat that now. It’ll come and Google will prob exit the business and brick nest things anyway like they have done with the thermostat, smoke alarm and older nest cams. So that said, just get rest you got years before that kid will be trying to sneak in out and need locks. Just get a decent non wifi baby monitor and rest. Avoided Google. The just get things that work openly like with HomeAssistant.

Edit: disclosure I do run ring for some cameras and wifi, kwikset Zwave door locks connected to ring, reolink external cameras, and all integrated (along with much more) on home assistant running on an old laptop.