Apparently I must wean him immediately, as little boys in particular are far too clingy to their mothers which is Not A Good Thing, and ds must be taught for his own good to let go.
When I said he's not at all clingy and only bfs at bedtime she replied 'Well, he's still bf, isn't he?'
And then she wondered why it took me so long after ds' birth to come in for a smear test...