Perinatal OCD: intrusive thoughts in pregnancy and after birth

What is perinatal OCD?

Perinatal OCD is obsessive-compulsive disorder that begins or worsens during pregnancy or the first year after birth. Obsessions are usually unwanted thoughts or images of the baby being harmed, contaminated or lost; compulsions include checking, avoiding, seeking reassurance and mental reviewing. It is distinct from postnatal depression and from postpartum psychosis, and it responds to ERP.

The thoughts new parents don't talk about

A new mother in Christchurch stands at the head of the stairs holding her six-week-old and an image flashes through her mind of dropping him. A father bathing his daughter suddenly pictures her slipping under the water. Someone chopping vegetables with the baby asleep in the next room has a thought about the knife that makes her feel sick.

These thoughts are far more common than most people realise. In a study of new mothers, intrusive thoughts of accidentally harming the baby were universal, and close to half reported unwanted thoughts of intentionally harming their infant. The thoughts are not wishes. They are the mind's threat system misfiring around the most precious thing in your life.

Perinatal OCD develops when those thoughts become stuck and start to drive behaviour. Common obsessions include harm (dropping, drowning, suffocating, sexual thoughts while changing a nappy), contamination (germs on bottles, chemicals, illness passed to the baby) and loss (cot death, kidnapping). The compulsions that follow can include checking breathing every few minutes through the night, sterilising bottles repeatedly, refusing to bathe the baby alone, hiding knives, avoiding stairs, asking your partner again and again whether you're a good parent, and endlessly reviewing your own thoughts for evidence about what they mean.

Fathers and partners develop perinatal OCD too, and people who already had OCD often find it worsens around the birth.

How common is perinatal OCD?

Older estimates put perinatal OCD at about 1 to 2 percent of pregnant or postpartum women. More recent Canadian research that asked specifically about perinatal symptoms found much higher rates: a weighted prevalence of 7.8 percent during pregnancy and 16.9 percent in the postpartum period, with about 9 percent of participants developing OCD for the first time by six months after birth.

The exact figure depends on how the question is asked, but the message is consistent. Perinatal OCD is not rare, it is under-recognised, and health professionals don't always ask about it.

Not postnatal depression, not psychosis: the differences that matter

Perinatal OCD is often mistaken for other conditions, and getting this right matters because the treatments differ.

• Postnatal depression centres on low mood, loss of interest and pleasure, hopelessness and exhaustion beyond ordinary tiredness. It can co-occur with OCD, and living with relentless intrusive thoughts can lead to depression. OCD's defining feature is the intrusive thought and the ritual that follows, which depression on its own does not have.
• Postpartum psychosis is a rare psychiatric emergency. A global systematic review found incidence estimates of roughly one to three in every thousand births. It usually begins suddenly in the days or first weeks after birth and involves confusion, severe mood swings, hallucinations or beliefs that are held as true. A woman with psychosis may not experience distressing thoughts as alien or wrong.
• Perinatal OCD is the opposite in an important way. The thoughts are experienced as horrifying, unwanted and completely against your values, which is exactly why they cause so much suffering. People with OCD recognise the thoughts don't fit who they are. OCD specialists note that perinatal OCD is not associated with acting on the thoughts.

If you are frightened by your thoughts, that fear is itself evidence that they don't match what you want. Clinicians writing in the British Journal of General Practice have warned that misdiagnosing perinatal OCD as psychosis causes real harm, including unnecessary admissions that worsened the OCD. Equally, psychosis needs urgent care; see the section below on when to seek help immediately.

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Treatment that fits around a baby

Exposure and response prevention (ERP), the form of CBT recommended for OCD by clinical guidelines, is used for perinatal OCD and adapted to your situation. NICE guidance on antenatal and postnatal mental health notes that anxiety disorders including OCD are under-recognised in this period and recommends prompt access to psychological treatment.

In practice, treatment involves understanding why your mind is producing these thoughts, learning that having a thought is not the same as wanting or intending it, and gradually reducing the compulsions that keep the fear alive. Exposures are built together and graded. They might start with bathing the baby while your partner sits nearby, then alone with the door open; preparing food with a knife while the baby is in the room; or letting your baby sleep without checking for a set stretch. Reassurance-seeking and mental reviewing are reduced step by step.

If you'd like, you're welcome to bring a support person to a session, such as your partner, a family or whānau member, or a friend. Partners are often the main source of reassurance, so joining part of a session can help them learn how to support you without feeding the OCD. Sleep deprivation is taken into account: the plan fits your energy, not an idealised version of it.

Medication is a separate decision. Some people use an SSRI alongside therapy; the British Journal of General Practice notes many women prefer not to take medication in the perinatal period. Whether medication is appropriate for you, in pregnancy or while breastfeeding, is a conversation for your GP, midwife, obstetrician or psychiatrist. Our psychologists don't advise on starting, stopping or changing medication, but we do work alongside your prescriber with your consent.

Doing this online with a baby in the house

Online sessions suit this stage of life. You don't need childcare or a drive across town, you can feed during the session, and if your baby wakes we pause. Because exposures happen at home (the bath, the stairs, the kitchen, the cot), practising in your own environment is an advantage rather than a compromise. If a session needs to move, 48 hours' notice lets you reschedule without charge.

Support in Aotearoa New Zealand

• Your GP or midwife can assess you, discuss medication, and refer you to your region's maternal mental health service. These Health NZ services are free and generally see women who are pregnant or have a baby under one year old with moderate to severe difficulties, usually by professional referral rather than self-referral.
• PlunketLine, 0800 933 922, is free, 24 hours a day, and answered by registered Plunket nurses who can talk through parenting stress and mental health concerns and point you to local services.
• Perinatal Anxiety and Depression Aotearoa (PADA) provides information about perinatal OCD and other perinatal mental health conditions, and regional lists of support services.
• 1737: call or text, free, any time, to talk with a trained counsellor.
• Just a Thought's free OCD course teaches CBT and ERP skills online and can be used alongside therapy.

When to get urgent help

Perinatal OCD itself is not an emergency, but some situations need same-day care. Contact your GP, midwife or local mental health crisis team today, or call 111 if there is immediate danger, if you or someone close to you notices:

• sudden confusion, severe agitation or rapidly changing moods in the days or weeks after birth
• hearing or seeing things others don't, or beliefs others around you don't share
• thoughts of harming the baby that feel like a plan or a good idea rather than a frightening intrusion
• thoughts of ending your own life

NICE guidance says sudden-onset symptoms suggesting postpartum psychosis should be assessed within hours. Free support is available any time by calling or texting 1737, or from Lifeline on 0800 543 354 (7am to midnight). Mindwell is not a crisis service.

What to expect at Mindwell

Mindwell's psychologists see adults 18+ anywhere in New Zealand by secure video, with no referral needed. ERP for OCD is delivered by four of our psychologists: Sandy Laurenson, Clinical Psychologist; Candice van der Merwe, Counselling Psychologist; Inge Prince, Clinical Psychologist; and Katherine Lee, Registered Psychologist. Sandy has ERP-specific training through the International OCD Foundation's Behavior Therapy Training Institute, and Katherine also works with parenting and perinatal mental health.

Sessions are 50 minutes, $199 + GST ($228.85 incl. GST), and first appointments are typically available within 7 days. Your first session usually covers what has been happening, your pregnancy or birth, your support at home and what you want to change, and you'll start working out a plan together. Information you share is confidential under the Health Information Privacy Code and shared only with your consent or where the law requires or allows it.

Related support: Intrusive thoughts · Harm OCD · Postnatal depression and anxiety · Contamination OCD