I did think about mastitis, but as Liebs self-weaned and there is no milk being produced any more (stopped about a 5m ago) I dismissed it. That should go away on its own too, right?

I rarely carry Liebling these days: he past 5 years now! I will pick him up if we're having a chat on the way to school in the morning, but not usually. Because then I'm carrying Liebling, his bookbag and his lunchbox. Whereas I normally only carry the lunchbox, if that.

Will hunt out the wheat bag we have. Sounds a lot cheaper than having to heat the water!