Probably go with something like a Ring and bypass your doorbell. You can short front to transformer and just power up the Ring doorbell. A normal doorbell works as a momentary switch to energize the coils. The Ring door bell draws power from the 16-24VAC transformer feeding the bell and then shorts its power terminals to cause the bell to ring. You do not need the doorbell mechanism and just send power to the Ring doorbell
The app will alert your phone when someone rings the bell or trips the motion and the sounds are different.
I would imagine if you got a separate Z-Wave or Zigbee door chime, you could schedule it ringing if you wanted a chime at times.
The best thing is that once your toddler no longer needs naps, you can unshort Front and Trans and go back to using your doorbell with the Ring doorbell.