Babies and grammas will truly both be fine left to their own devices for 2-3 hours once a week, some crying isn't neglect, but I understand if you choose not to leave the infant's side for months. It is very taxing though and I wonder if you consider the effect on your mental health, which affects them, if you don't get enough breaks, especially considering your worry about postpartum depression?

It's very easy as a mother to back ourselves into the 'there is no solution' corner - I see you wrote above "my only choice" so keep in mind, there really are more choices.

At any rate, I hope you find a good solution!