Hi!
I have a full time job as well as my hubby, so jeanie is home alone all day. We have a dog walker come in at 12:30 - to break up the day - and I know she loves it (I watch her on my webcam and see her excitement when she shows up and how she waits in the window starting at 11:30 for her - so cute).
I make sure there is NOTHING For her to get into - and the room where the cat litter is, I just put a baby gate up, so Jeanie can't get in. It's also where the computer is with all the cords!! She does chew cords when she can get at them........
We have slowly introduced her to the whole house. Originally, around the age your pup is, we kept her in a crate all day, with the break at 12:30........to potty train her. She didn't have room in the crate to go, it was a small crate (recommended by the yorkie talk community) so that she would hold it, and she did....and then was trained in a month or so........Once that happened, we let her roam around the kitchen, till a year old. Then the whole house, minus the rooms with the doors closed. We have always had the dog walker to break up the day, and give her time to pee, and socialize with her and other dogs on the walk.
It seems to work well for Jeanie. I hope you find just the right formula for your baby too