The term ‘baby blues’ describes a mild short, period of depression which many women experience after childbirth. Few people are aware that as many as 10% of all recently delivered women develop postnatal depression. However, the true incidence is probably far higher, for postnatal depression is often missed or misdiagnosed. In a proportion of these mothers the depression may be of such severity that they need out-patient psychiatric help and many need drug therapy. Women are often reluctant or simply too tired to consult doctors, particularly if they expect having a baby to be nothing but a source of joy. Sometimes they don’t even realise they are depressed until they emerge from it.