Postpartum period
During the subacute postpartum period, psychological disorders may emerge. Among these are postpartum depression, posttraumatic stress disorder, and in rare cases, puerperal psychosis. Postpartum mental illness can affect both mothers and fathers, and is not uncommon. Early detection and adequate treatment is required. Approximately 25% – 85% of postpartum women will experience the "blues" for a few days. Between 7% and 17% may experience clinical depression, with a higher risk among those women with a history of clinical depression. Prevalence of PTSD following normal childbirth (excluding stillbirth or major complications) is estimated to be between 2.8 and 5.6% at 6 weeks postpartum.
Maternal deprivation
The quality of parental care was considered by Bowlby to be of vital importance to the child's development and future mental health. It was believed to be essential that the infant and young child should experience a warm, intimate, and continuous relationship with his mother (or permanent mother substitute) in which both found satisfaction and enjoyment. Given this relationship, emotions of guilt and anxiety (characteristics of mental illness when in excess) would develop in an organised and moderate way. Naturally extreme emotions would be moderated and become amenable to the control of the child's developing personality. He stated, "It is this complex rich and rewarding relationship with the mother in the early years, varied in countless ways by relations with the father and with siblings, that child psychiatrists and many others now believe to underlie the development of character and mental health."
The state of affairs in which the child did not have this relationship he termed "maternal deprivation". This term covered a range from almost complete deprivation, not uncommon in institutions, residential nurseries and hospitals, to partial deprivation where the mother, or mother substitute, was unable to give the loving care a small child needs, to mild deprivation where the child was removed from the mother's care but was looked after by someone familiar whom he trusted. Complete or almost complete deprivation could "entirely cripple the capacity to make relationships". Partial deprivation could result in acute anxiety, depression, neediness and powerful emotions which the child could not regulate. The end product of such psychic disturbance could be neurosis and instability of character. However, the main focus of the monograph was on the more extreme forms of deprivation. The focus was the child's developing relationships with his mother and father and disturbed parent–child relationships in the context of almost complete deprivation rather than the earlier concept of the "broken home" as such.