Bjorns are simply not optimal for baby or wearer. There are much better options out there now supported by new evidence.
OP, babywearing will make a huge difference when chasing a toddler around and carrying a newborn. It ha been my saviour!!
Just be mindful a Bjorn style carrier doesn't provide optimal head support, so if you have to bend or pick things up, babies head can flail about. You can get around that by looking into a wrap like a Hug A Bub (for example) for those early days..
If you enjoy the benefits and want to keep going I'd look into a soft structured carrier like the Ergo for the future as you will get more use as it goes up to 20kg and you can go on the back.
Having hands free is wonderful and I hope you find a comfortable carrier for long term use!