Postpartum Hormonal Changes: How They Influence Sleep, Mood, and Physical Recovery

By Birth & Baby University · Last updated: October 2026 · 3 min read

After birth, estrogen and progesterone fall sharply, the placenta is gone, lactation hormones rise and sleep is disrupted. It is tempting to explain every tear and sleepless night as “hormones.” The research supports hormone effects for some people and some symptoms, and warns against treating it as the whole story. This article sorts out what is known.

Key takeaways

• In a small controlled experiment, mood symptoms appeared after simulated withdrawal of estradiol and progesterone in women with a history of postpartum depression (5 of 8) and in none of eight comparison women.
• The “baby blues” are common: a meta-analysis of 26 studies estimated a prevalence of 39 percent (range 13.7 to 76 percent), with very high heterogeneity.
• Postpartum thyroiditis occurs in about 5 percent of women in the first year and can mimic mood and energy problems.
• Hormones are one contributor among sleep loss, stress, support and history. A normal hormonal shift does not explain severe or persistent symptoms.

What the research says

Sex hormones and mood

A double-blind experiment published in 2000 simulated pregnancy and birth hormone conditions by inducing hypogonadism, adding back high doses of estradiol and progesterone for 8 weeks, then withdrawing them. Five of eight women with a history of postpartum depression developed significant mood symptoms during withdrawal, and none of eight comparison women did. The authors concluded that estrogen and progesterone are involved in a subgroup of women who are differentially sensitive. A 2022 follow-up study of 30 women using the same design found anhedonia increased during hormone phases in women with a history of postpartum depression and not without it, and that both groups showed reduced reward-circuit activation after withdrawal, while the authors said the results do not explain which people are hormone sensitive. Both studies are very small, used a model of hormone change in people who were not postpartum, and relate to a subgroup.

The baby blues

A 2020 meta-analysis of 26 studies (5,667 women) estimated the prevalence of maternity blues at 39.0 percent (95% CI 32.3 to 45.6) with a range of 13.7 to 76.0 percent across studies and I2 of 96.6 percent, and recommended attention to key symptoms and education for providers and mothers. The variation reflects differences in definition, timing and tools, so no single number should be quoted as fact. The review does not address when to worry, but symptoms that deepen or last should be evaluated, a point covered in the articles on postpartum anxiety and screening.

Thyroid changes

A 2019 review of postpartum thyroiditis describes it as an autoimmune destructive thyroiditis in the first postpartum year with a prevalence of 5 percent, needing differentiation from Graves hyperthyroidism, and notes increased risk of recurrent episodes and permanent hypothyroidism. A 2022 review of thyroid disorders in pregnancy and postpartum states postpartum thyroiditis can occur up to a year after delivery and must be differentiated from other thyroid dysfunction because treatment differs. Fatigue, palpitations, mood changes and weight changes can have many causes, so persistent symptoms deserve a medical evaluation rather than an assumption about hormones.

Sleep and the hormonal picture

The article on sleep deprivation in this series notes that postpartum sleep interventions modestly reduced depressive symptoms in a 60-study meta-analysis. Sleep, hormones and stress interact, and the available studies do not separate them.

What this means for doulas

• Explain the shift in plain terms. “Your hormones changed quickly, which can affect mood, sleep and energy” is accurate and gentle.
• Do not use “just hormones” to dismiss. Persistent sadness, anxiety, panic, intrusive thoughts, exhaustion with palpitations or weight change, or thoughts of harm need evaluation.
• Mention thyroid as a possibility, not a diagnosis. If symptoms are persistent, encourage a conversation with the provider about testing. Do not suggest self-treatment.
• Acknowledge individual history. A history of postpartum depression raises concern in some research, so pay particular attention to those clients and help them plan support ahead of birth.

Putting the evidence into practice

• Teach the arc of normal feelings in the first two weeks (tearfulness, irritability, overwhelm) and the signs that mean “call someone.”
• Check in at consistent intervals, since symptoms can emerge weeks after birth.
• Keep referral resources ready, including 988 and the National Maternal Mental Health Hotline (1-833-852-6262).
• Encourage the comprehensive postpartum visit and bring questions about mood, sleep and energy.

The bottom line

Postpartum hormone shifts are real and relevant for some people’s mood, but they are one piece of a bigger picture and should never be a reason to wait on persistent symptoms. Doulas help by explaining honestly, watching for warning signs and linking clients to care.

This article is for professional education. It is not medical, legal or tax advice. Check the standards of your certifying organization and the rules where you work.

Sources and further reading

• Bloch M, et al. Effects of gonadal steroids in women with a history of postpartum depression. American Journal of Psychiatry 2000. Read the source
• Schiller CE, et al. Effects of gonadal steroids on reward circuitry function and anhedonia in women with a history of postpartum depression. Journal of Affective Disorders 2022. Read the source
• Rezaie-Keikhaie K, et al. Systematic Review and Meta-Analysis of the Prevalence of the Maternity Blues in the Postpartum Period. JOGNN 2020. Read the source
• Nguyen CT, et al. Postpartum Thyroiditis. Clinical Obstetrics and Gynecology 2019. Read the source
• Lee SY, et al. Assessment and treatment of thyroid disorders in pregnancy and the postpartum period. Nature Reviews Endocrinology 2022. Read the source
• National Institute of Mental Health. Perinatal Depression. NIH web page, read 16 October 2026 (National Maternal Mental Health Hotline, 1-833-852-6262; 988 Suicide and Crisis Lifeline). Read the source
• Office on Women’s Health, U.S. Department of Health and Human Services. Postpartum depression. Web page (page dated October 17, 2023), read 16 October 2026. Read the source

Explaining the postpartum body in clear, honest language is part of postpartum doula work. See the training and mentorship options on the For Doulas page.

More for professionals: the Professionals Blog.