Medical condition
Postpartum blues, also known as baby blues and maternity blues, is a very common but self-limited condition that begins shortly after childbirth and can present with a variety of symptoms such as mood swings, irritability, and tearfulness. Mothers may experience negative mood symptoms mixed with intense periods of joy. Up to 85% of new mothers are affected by postpartum blues, with symptoms starting within a few days after childbirth and lasting up to two weeks in duration. Treatment is supportive, including ensuring adequate sleep and emotional support. If symptoms are severe enough to affect daily functioning or last longer than two weeks, the individual should be evaluated for related postpartum psychiatric conditions, such as postpartum depression and postpartum anxiety. It is unclear whether the condition can be prevented, however education and reassurance are important to help alleviate patient distress.
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Signs and symptoms.
Symptoms of postpartum blues can vary significantly from one individual to another, and from one pregnancy to the next. Many symptoms of postpartum blues overlap both with normal symptoms experienced by new parents and with postpartum depression. Individuals with postpartum blues have symptoms that are milder and less disruptive to their daily functioning compared to those with postpartum depression. Symptoms of postpartum blues include, but are not limited to:
Onset.
Symptoms appear within 4 weeks of delivery and can last for years. (49)
Duration.
Postpartum blues may last a few days up to two weeks. If symptoms last more than two weeks, evaluation for postpartum depression is recommended by the American Psychiatric Association. 
Causes.
The causes of postpartum blues have not been clearly established. Most hypotheses regarding the etiology of postpartum blues and postpartum depression center on the intersection of the significant biological and psychosocial changes that occur with childbirth.
Psychosocial causes.
Pregnancy and postpartum are significant life events that increase a woman's vulnerability for postpartum blues. Even with a planned pregnancy, it is normal to have feelings of doubt or regret, and it takes time to adjust to having a newborn. Feelings commonly reported by new parents and lifestyle changes that may contribute to developing early postpartum mood symptoms include:
Risk factors.
Most risk factors studied have not clearly and consistently demonstrated an association with postpartum blues. These include sociodemographic factors, such as age and marital status, and obstetric factors, such as delivery complications or low birth weight.
Factors most consistently shown to be predictive of postpartum blues are personal and family history of depression. This is of particular interest given of the bidirectional relationship between postpartum blues and postpartum depression: a history of postpartum depression appears to be a risk factor for developing postpartum blues, and postpartum blues confers a higher risk of developing subsequent postpartum depression.
Pathophysiology.
Estrogen and progesterone.
After delivery of the placenta, mothers experience an abrupt decline of gonadal hormones, namely estrogen and progesterone. Major hormonal changes in the early postpartum period may trigger mood symptoms similarly to how more minor hormonal shifts cause mood swings prior to menstrual periods.Studies have not detected a consistent association between hormone concentrations and development of postpartum mood disorders. Some investigators believe the discrepant results may be due to variations in sensitivity to hormonal shifts across different subgroups of women. Therefore, development of mood symptoms may be related to a woman's sensitivity, based on genetic predisposition and psychosocial stressors, to changes in hormones rather than absolute hormonal levels.
Other.
The association between postpartum blues and a variety of other biological factors, including cortisol and the HPA axis, tryptophan, prolactin, thyroid hormone, and others have been assessed over the years with inconclusive results. Prolactin contributes to providing the correct amount of energy to support the mother and the fetus/offspring during pregnancy and lactation, but it also has a homeostatic role.
Emerging research has suggested a potential association between the gut microbiome and perinatal mood and anxiety disorders.
Although several studies have measured lower levels of allopregnanolone associated with postpartum depression, and identified lower allopregnanolone levels as a risk factor for postpartum depression, many others fail to demonstrate such a relationship. Those studies that do suggest a relationship demonstrate reductions in allopregnanolone levels in women with a risk of developing postpartum depression, a reduction in women experiencing postpartum blues, and a negative correlation with depression symptoms in postpartum women. 
Diagnosis.
Classification.
The proper diagnostic classification of postpartum blues has not been clearly established. Postpartum blues has long been considered to be the mildest condition on the spectrum of postpartum psychiatric disorders, which includes postpartum depression and postpartum psychosis. However, there exists some discussion in the literature of the possibility that postpartum blues may be an independent condition.
Criteria.
There are no standardized criteria for the diagnosis of postpartum blues. Unlike postpartum depression, postpartum blues is not a diagnosis included in the Diagnostic and Statistical Manual of Mental Disorders.  
Investigators have employed a variety of diagnostic tools in prospective and retrospective studies of postpartum blues, including repurposing screening tools, such as the Edinburgh Postnatal Depression Scale (EPDS) and Beck Depression Index (BDI), as well as developing blues-specific scales. Examples of blues-specific scales include the Maternity Blues Questionnaire and the Stein Scale.
Differential diagnosis.
Although symptoms of postpartum blues present in a majority of mothers and the condition is self-limited, it is important to keep related psychiatric conditions in mind as they all have overlap in presentation and similar period of onset.
Additionally, a variety of medical co-morbidities can mimic or worsen psychiatric symptoms.  
Prevention.
Screening.
There are no specific screening recommendations for postpartum blues. Nonetheless, a variety of professional organizations recommend routine screening for depression and/or assessment of emotional well-being during pregnancy and postpartum. Universal screening provides an opportunity to identify women with sub-clinical psychiatric conditions during this period and those at higher risk of developing more severe symptoms. Specific recommendations are listed below:
Primary prevention.
Given the mixed evidence regarding causes of postpartum blues, it is unclear whether prevention strategies would be effective in decreasing the risk of developing this condition. However, educating women during pregnancy about postpartum blues may help to prepare them for these symptoms that are often unexpected and concerning in the setting of excitement and anticipation of a new baby. Mothers who develop postpartum blues often have significant shame or guilt for feelings of anxiety or depression during a time that is expected to be joyful. It is important to reassure new parents that low mood symptoms after childbirth are common and transient. Obstetric providers may recommend that patients and their families prepare ahead of time to ensure the mother will have adequate support and rest after the delivery. Additionally, they should provide education and resources to family and friends about red flags of more severe perinatal psychiatric conditions that may develop, such as postpartum depression and postpartum psychosis.
Treatment.
Postpartum blues is a self-limited condition. Signs and symptoms are expected to resolve within two weeks of onset without any treatment. Nevertheless, there are a number of recommendations to help relieve symptoms, including:
If symptoms do not resolve within two weeks or if they interfere with functioning, individuals are encouraged to contact their healthcare provider. Early diagnosis and treatment of more severe postpartum psychiatric conditions, such as postpartum depression, postpartum anxiety, and postpartum psychosis, are critical for improved outcomes in both the parent and child.
Prognosis.
Most mothers who develop postpartum blues experience complete resolution of symptoms by two weeks. However, a number of prospective studies have identified more severe postpartum blues as an independent risk factor for developing subsequent postpartum depression. More research is necessary to fully elucidate the association between postpartum blues and postpartum depression.
Epidemiology.
Postpartum blues is a very common condition, affecting around 50–80% of new mothers based on most sources. However, estimates of prevalence vary greatly in the literature, from 26 to 85%, depending on the criteria used. Precise rates are difficult to obtain given lack of standardized diagnostic criteria, inconsistency of presentation to medical care, and methodological limitations of retrospective reporting of symptoms.
Evidence demonstrates that postpartum blues exists across a variety of countries and cultures, however there is considerable heterogeneity in reported prevalence rates. For instance, reports of prevalence of postpartum blues in the literature vary from 15% in Japan to 60% in Iran. Underreporting of symptoms due to cultural norms and expectations may be one explanation for this heterogeneity.
Males.
Literature is lacking on whether new fathers also experience postpartum blues. However, given similar causes of postpartum blues and postpartum depression in women, it may be relevant to examine rates of postpartum depression in men.
A 2010 meta-analysis published in JAMA with over 28,000 participants across various countries showed that prenatal and postpartum depression affects about 10% of men. This analysis was updated by an independent research team in 2016, who found the prevalence to be 8.4% in over 40,000 participants. Both were significantly higher than previously reported rates of 3–4% from two large cohort studies in the United Kingdom, which may reflect heterogeneity across countries. Both meta-analyses found higher rates in the United States (12.8–14.1%) compared to studies conducted internationally (7.1–8.2%). Furthermore, there was a moderate positive correlation between paternal and maternal depression ("r" = 0.308; 95% CI, 0.228–0.384).
References.
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