My DS is nearly 10 weeks old and when he was weighed a fortnight ago he weighed nearly a stone (he's also 62cm long). I am suffering with my back as lifting him up and down is taking its toll I think. Am thinking of getting a sling for when we take him out as some places may not be easy to access with buggy, but is it going to kill my back even more? I'm struggling to walk round with him or stand swaying to get him to sleep so I don't know if a sling is a good idea. Any advice?