Oh, man, mamma - did you open a can of worms.
I'll bet that you didn't know that both the Bjorn and facing out are a big old source of debate in the babywearing world, ha? I swear...us moms can't get a break can we?
The Bjorn get a lot of flack in the babywearing world because of how the hips rest in that type of carrier. I'm not sure of all the ins and outs but there are plenty of good articles on the internet. With that said, I think the Bjorn is the type of carrier that the wearer tends to only use a little bit (I can't see a child spending hours in the Bjorn the way they would in a different type carrier) so the hip issue seems a bit exaggerated to me. 
What I will say about the Bjorn is that there are much better carriers out there if you can get your hands on one. Even something like the Moby wrap would be a great alternative for your LO and they are available second hand for like 20 bucks. The Ergo and the like are similar to the Bjorn in function but place the baby's hips better and I think they're way more comfortable.
On the subject of facing out -- that's a whole 'nother thing. Again -- there's lot of information about that online. I, personally, don't think wearing a baby facing out for a limited time is such a bad thing. I used a ring sling and scrunched the baby's legs up and let her face out when she was young. After that the hip carry is ideal.
And now you're probably asking yourself why I posted all of this to your simple, innocent question.
What was the question again...
Oh, yes, is your LO ready to face out in a carrier like the Bjorn. I think I'd look at the Bjorn instructions and follow that and your instincts on this one. That, and see if you can get your hands on a few other carriers - cuz there are some wonderful options out there that will make your babywearing life much more interesting.
Congrats on a strong LO!
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