Baby carrier has broad straps, which make it easy to wear. When the child becomes heavier you can use the carrier as a safety belt for the child: child sits in lap, shoulder straps are loose.
Model: Baby carrier Babybjörn Sjöman
Keep shoulder straps loose to remove child’s weight from shoulders, which makes it easier to drive the wheelchair.
Babyland or other children’s store
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See also www.youtube.com/watch?v=dWZI_wFwZnE#t=101
This tip is from 2005