My DS is nearly a year old and weighs around 12.5kg. I've been doing fine with the Ergo until very recently, but I now find it gives me a lot of pain in my lower back and coccyx - to the extent that the area hurts if I press it, even hours after carrying him. The Ergo on my back is not much better and has the disadvantage of leaving me unable to wear a rucksack. (I also have a 4yo and she still needs hand-holding as we live in London.)
When she was little I used a BushBaby carrier, but didn't find it especially comfortable, and it was very bulky. Do I need to dig out my pushchair, or is there anything that might be less painful? I know about the Arnos Grove and Somers Town sling libraries: unfortunately, their hours are very limited right now.