When planning to wear 17 lb child in a Bjorn for 4 hours in a row, first do a week’s worth of strength building exercises. Secondly, maybe wear her for oh, say an hour a day for a few days and build up to the Bjorn Marathon.
Wow are my shoulders and back sore! I didn’t have this problem when she was only 10 lbs. I’ll definitely be getting my weight bearing exercise if I carry her around a bit in that thing every day at school! Wowsa!