Cover of Rattled: How to Calm New Mom Anxiety with the Power of the Postpartum Brain

The book by Nicole Amoyal Pensak, Ph.D.

RATTLED

How to Calm New Mom Anxiety with the Power of the Postpartum Brain

An evidence-based postpartum anxiety book for expecting and new parents—helping readers understand intrusive thoughts, interrupt anxiety cycles, navigate matrescence, and trust the adaptive power of the postpartum brain.

Written for new mothers, expecting parents, partners, grandparents, clinicians, and the people who support families through early parenthood.

Available in hardcover, paperback, e-book, and audiobook · 240 pages · Countryman Press · Hardcover ISBN 978-1-68268-830-4

Why RATTLED

You are not failing. Your brain is adapting.

New parenthood can feel like love and fear arriving at the same time. RATTLED makes room for both.

Drawing on neuroscience, clinical practice, and her own experience of becoming a mother, Dr. Pensak offers a different way to understand postpartum anxiety. The book explains how the brain reorganizes in response to the enormous demands of caring for a baby—and why the same adaptive systems that make a parent vigilant can sometimes begin running the show.

RATTLED helps readers identify the cycles that maintain anxiety, respond differently to intrusive thoughts, work with uncertainty, and reclaim a sense of capability. It is not a demand to optimize motherhood. It is an invitation to understand the transition more honestly and meet it with evidence, self-compassion, and practical support.

RATTLED provides education and practical support; it does not replace individualized mental health care. If you are looking for personalized support, explore Dr. Pensak’s clinical practice and confirm current fit and availability.

Inside the Book

A steadier way through early parenthood.

The science is rigorous. The language is clear. The tools are designed for the exhausted, emotionally loaded moments in which parents actually need them.

01

Understand the postpartum brain

Learn why heightened vigilance, sensitivity, and change are often signs of adaptation—not personal failure.

02

Name what feels hard

Make sense of anxiety, intrusive thoughts, identity shifts, relationship strain, and the pressure to feel grateful all the time.

03

Use skills that hold up in real life

Translate evidence-based psychology into practical tools for the middle of the night, the pediatrician’s office, and the moments no one posts.

Choose your edition

Read or listen to RATTLED.

Choose print, e-book, or audio—or visit the publisher for additional retailer options.

Hello Sunshine · The Bright Side

The Brilliance of the Postpartum Brain

Dr. Pensak joined Danielle Robay and Simone Boyce to discuss matrescence, the profound postpartum changes parents experience, and how to leverage the adaptive power of the maternal brain.

“Mom brains are brilliant brains.”

February 26, 2025

Selected moments from @hellosunshine

04 images

Hello Sunshine logo with black lowercase text inside a bright yellow circle on a black background
01Hello Sunshine
Screenshot of the Hello Sunshine Instagram grid featuring Dr. Nicole Pensak, Reese Witherspoon, and the RATTLED story
02Dr. Pensak and Reese Witherspoon on @hellosunshine
Dr. Nicole Pensak holding RATTLED beside the words Mom brains are brilliant brains
03Mom brains are brilliant brains.
Quote by Dr. Nicole Pensak about the psychological process of becoming a mother
04The psychological process of becoming a mother.
Portrait of Dr. Nicole Amoyal Pensak

Good Inside RATTLED podcast appearance

Rattled—Motherhood, Identity, and Postpartum Depression

A video interview on postpartum mental health, maternal identity, ‘mom brain,’ depression, and practical support for parents and clinicians.

Good Inside · Rattled: When New Parenthood Shakes You

Praise for RATTLED

What leading authors and clinicians are saying.

The complete endorsement collection from Dr. Pensak’s original RATTLED website, preserved here with its original wording and attribution.

Becoming a new mother can be extremely overwhelming, and it can lead to increased mental stress. Dr. Pensak has done an exceptional job in examining the ins and out of maternal mental health and providing practical and accessible evidence-based knowledge and strategies for new parents.

Eve Rodsky

Best-selling author of Fair Play

RATTLED is an evidence-based, no-nonsense resource I wish every new parent had. As an OB-GYN and MFM, I spend a lot of time discussing with patients what the postpartum period might be like, and I still learned so much from Dr. Pensak’s insights into the postpartum brain and mental health. She breaks down complex science in a way that’s accessible, validating, and genuinely helpful. I loved this book and am recommending it to my patients.

Dr. Nathan Fox

Co-Author of The Unexpected with Emily Oster

Postpartum anxiety is common but often overlooked, leaving many new parents feeling unprepared and alone. In Rattled, Dr. Nicole Pensak offers an accessible, evidence-informed guide to understanding and managing anxiety during pregnancy and the postpartum period. She brings her knowledge of evidence-based practice and her clinical experience as a perinatal psychologist, as well as her own experiences with anxiety after giving birth during the pandemic. She has written a book that is a beautiful blend of wisdom, compassion and down-to-earth sensibility.

While Rattled will be particularly helpful for those struggling with anxiety, this book will resonate with a wide range of pregnant and new parents—and is a book I will definitely recommend to my patients.

Ruta Nonacs, MD PhD

MGH Center of Women’s Mental Health · Editor-in-Chief of womensmentalhealth.org

Nicole Pensak’s book is the essential item for new moms, included in baby showers and gifted from one tired mama to another. Thank goodness she is here to help and look out for all of us!

Zibby Owens

Host of Moms Don’t Have Time to Read Books

RATTLED will be a useful tool for many new mothers, offering practical advice on how to build up their support system during pregnancy and tools for coping postpartum with their own changing neurobiology.

Chelsea Conaboy

Author of Mother Brain: How Neuroscience Is Rewriting the Story of Parenting

Our children are precious—and so are their mothers. This extraordinarily helpful book provides fresh insights and many practical suggestions for those crucially important first years. Dr. Pensak is brilliant, funny, blunt, honest about her own experiences, and endlessly kind and supportive. In our turbulent days—and when the so-called village it takes to raise a child often looks more like a ghost town—we need her guidance more than ever.

Rick Hanson, PhD

Author of Mother Nurture and Buddha’s Brain

Rattled is a powerful and much-needed resource for new mothers. With warmth, wisdom, and scientific insight, Dr. Nicole Pensak brings clarity to the often-misunderstood experience of the postpartum period. She has a rare gift for making complex science both accessible and deeply reassuring, helping mothers feel seen, understood, and supported. This book will be a source of comfort and strength for many.

Karen Kleiman

Founder, The Postpartum Stress Center · Author on postpartum depression and anxiety

Nicole Pensak's Rattled answers so many of the questions my wife and I had about how motherhood changes, influences, and shapes new moms. Pensak is the perfect guide on this journey, enriching Rattled with her experiences as an author, researcher, scientist, therapist—and, of course, mom—trained in post-partum therapy, anxiety, and depression. Highly recommended!

Adam Alter

New York Times Bestselling Author of Anatomy of a Breakthrough and Irresistible

In this incredibly supportive and practical resource, Rattled guides new mothers through the power and peril of matrescense, the developmental stage of motherhood . Through a blend of rigorous science and personal anecdotes, Dr. Pensak offers compelling new and alternative explanations for our anxieties and perceived inadequacies while artfully connecting us with a concrete and hopeful path forward.

Jamie Jacobs, PhD

Director of Caregiving Research · Assistant Professor of Psychology, Harvard Medical School

Rattled is a must read for all mothers. Dr. Pensak seamlessly blends science and practical strategies that finally changes the narrative around ‘mommy brain’. Eloquently capturing the true wonder of the mother’s brain, Dr. Pensak brings much needed attention and clarity to the physiological and psychological changes that occur over the course of a mother’s development and shares tangible strategies/easy to use tools to empower mothers through their own evolution (and protect their mental health). Dr. Pensak is funny, raw, and inviting, sharing her own unique journey into the chaotic and beautiful world of motherhood. Thank you, Dr. Pensak for helping us as mothers’ feel seen during this time of profound transformation and for giving us the tools to ‘up the ante’ and thrive.

Rattled has instantly reached the top of my list of recommendations for all moms I work with. I can’t wait to recommend to my patients, family and friends.

Elizabeth Reichert, Ph.D.

Associate Clinical Professor · Co-Director, Stanford Parenting Center · Stanford Child and Adolescent Psychiatry

View the original RATTLED page

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Invite Dr. Pensak to speak on the postpartum brain, anxiety, and matrescence.

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