We have a 6 month old SBT, George. We got him at 8 weeks old and for the first 4 weeks we kept him in the laundry through the day while we were at work. I just made sure that he had plenty of toys in with him, his bed (a doggie beanbag and a blanket) and we had a clock radio in there with the radio playing softly all day. We covered the floors with newspaper on top of blue plastic tarps from bunnings (which we hosed off every night and rotated them around). All in all he was pretty good, with only the door stops and one piece of skirting board that came to a sticking out corner chewed! (white vinegar in a spray bottle sprayed on the chewed area seemed to help stop the munching ). Just make sure there's no cords hanging down, or plugged in that your baby could pull or chew on.
At 12 weeks old we started leaving George outside through the day. I left for work at 7:45 and my partner was home around 5. George has coped fine with being on his own through the day. We'd have a big game of ball before I left, then I'd give him some treats and his breakfast (which I still do right before I leave) and he's fine. He knows that when we get home, he's inside with us.
He's also great with kids and the elderly. He can get a bit rough when playing with us at times (we dont have human children, just a doggy one), but around my 5, 3, 2 & 1 yo nephew's and nieces or my 89 yo grandfather, he's the very gentle and well behaved.
One suggestion is that anything you want to keep in your garden - fence off. We've had to put plastic lattace all around our pot plants that George could reach the top of, as we were coming home to empty pots where he'd dug them out, and our BBQ covers have been shredded, but its a small price to pay for the joy he brings us. The other thing I've done is to ensure that he's been well socialised with other dogs.
Enjoy, SBT's are fantastic dogs, George is our first and he's the best! Such a personality! (who's sound asleep on his back with his legs in the air and snoring on the couch beside me as I type! ) They love your company, want to be with you, sit on your feet, and snuggle up to you on the couch to watch TV. They snore and burp (and fart! ). But best of all, they give you unconditional love.