When can baby face outward in his baby carrier?


I wear my baby a lot and I face him towards me since I’ve read thats best for newborns hips and legs and stuff. But my lil guy is huge (over 17 lbs and 26 inches) and he loves when I carry him around facing out. I just do this with my arms around the house but my arms get super tired from my chunkster lol. My baby carrier can convert to outward facing or to a hip carry. Would either of those be safe? I know he’d like to look at more stuff. He will be 13 weeks tomorrow and he can hold his head up very well. He can roll from his back to side but nothing else. He cannot sit unsupported.