If your frog is female you can expect a pretty long lifespan, males don't seem to hang around as long. When i got Ed i though it was a male. We later renamed her Edwenia. ( Remember the line, Put Edweinia back in bowl!?)
If she acts hungry i feed her, striking at the glass, hopping around, lunging. She wants to be fed. If i dangle a mouse in front of her and she ignores it, back it goes to the mouse bin. I'm leery of leaving any food animal in the tank as they can attack the frogs. Both mice and crickets can do a lot of damage.
When she start refusing food in the fall/winter as it cools down i stop offering food. Because Ed is so large i have given up keeping anything in her tank, she just destroys everything and makes a stinky mess. So she hasn't buried up in a long time. Mostly she just hunkers down and i clean her tank about every 2 weeks. When things start to warm up again she lets me know when she's ready for more food. I think the trick is not to over feed in the fall. Let them have an empty belly for a while. This way food doesn't rot in the gut while the frog is cold.
Good luck with your baby.