Not Ergo...
Hi,
I am 158cm and weigh only 42kg and though my baby is only 6kg, I have bad back and shoulders from using 2 baby carriers before.
I recently brought a wrap from US (not Ergo) that is great, after using it, I cannot feel my baby's weight anymore, what's more , my baby who is a really fussy one,fell asleep the first time I carried her inside there. If you are interested I can PM you the details.
Cheers