[Post natal depression: the socio-environmental factors].

In the weeks and months that follow the birth of a child, between 10 and 20 per cent of mothers experience serious or moderate symptoms of depression. This state of psychological distress affects the mother-infant interaction, and can modify the child's development in the longer term. Recent studies increasingly link these symptoms to environmental and psychosocial stress factors. The setting up of relevant and efficient prevention and promotion programs requires a better understanding of the effect of stress and social support on the mental health of mothers.