How long after birth can postnatal depression start?

There is no single starting day. Symptoms may become noticeable while the body is recovering, after support decreases, when sleep deprivation accumulates, or when the demands of caring for a baby change. They can also emerge after an initially positive adjustment. Feeling low, anxious, irritable, numb, guilty, or unable to enjoy daily life is worth mentioning even if the birth was not recent.

Postnatal depression is different from a short-lived emotional fluctuation because symptoms persist, intensify, or interfere with functioning and relationships. A clinician can also consider thyroid problems, anaemia, medication effects, trauma, or other mental-health conditions that may need attention.

Keep a simple record of mood, sleep, appetite, intrusive worries, and tasks that have become difficult. Share it with a doctor, midwife, obstetric clinician, or mental-health professional. Ask a trusted person to help with transport, meals, or baby care while you arrange an assessment.

Support can include counselling, practical adjustments, peer support, and medicine when clinically suitable. Tell the clinician if you are breastfeeding, expressing milk, pregnant again, or taking other medicines. Learn more through [Perinatal Mental Health Support](/treatments/medical-gynaecology/perinatal-mental-health-support/) and [Low Mood After Birth](/symptoms/postnatal-low-mood/).

Get urgent help if you have thoughts of suicide or harming the baby, feel unable to stay safe, cannot meet basic needs, or experience confusion, hallucinations, or extreme agitation. Tell someone you trust, avoid being alone, and contact local emergency services or attend an emergency department. Symptoms that are not immediately dangerous still deserve timely assessment.

Ask when your symptoms may fit postnatal depression, what other physical causes should be checked, which support is available, and how quickly treatment may help. Also ask who to contact outside appointments if symptoms suddenly worsen.