Evidence Based Birth®

EBB 384 - Evidence on "What is a Due Date?"

Evidence Based Birth®

Show Notes

What is a due date, and how accurate is it, really? Dr. Rebecca Dekker is joined by Dr. Sara Ailshire of Team EBB to walk through the latest research on due dates, pregnancy length, and what happens when pregnancies go past term. They share the new research on ultrasound dating, the natural length of pregnancy, genetics, and stillbirth risk. They also talk about what a due date actually represents and how pregnancy length varies widely between individuals.

Content Note: This episode contains discussion of stillbirth, starting at 26:10 and ending at 40:57. Please take care while listening.

Read the Evidence on "What is a Due Date?" here.

(05:24) What is a due date and what it isn't (06:16) How due dates are traditionally calculated (09:45) Research on ultrasound accuracy (12:25) Safety of ultrasound & the ALARA principle (16:38) Why studying pregnancy length is complicated (22:27) Genetics and family history of longer pregnancies (25:41) Why providers worry about going past due dates (27:50) Understanding stillbirth risk and the U-shaped curve (34:20) Racial disparities in stillbirth risk (38:37) What pregnant people can do to lower risk (40:25) Sleep position, fetal movement awareness, and prenatal care (44:06) Balancing trust in birth with honest risk communication (45:20) What we know (and don't know) about placental aging

Resources Count the Kicks: https://countthekicks.org/ PUSH Pregnancy: https://www.pushpregnancy.org/ Star Legacy Foundation: https://starlegacyfoundation.org/ Healthy Birth Day: https://healthybirthday.org/ CDC Stillbirth resources: https://www.cdc.gov/stillbirth/communication-resources/index.html Share Pregnancy and Infant Loss Support: https://nationalshare.org/ Stillbirth and infant loss support communities: https://postpartum.net/group/stillbirth-and-infant-loss-support-for-parents/

More from Evidence Based Birth®

Oct 21, 2026

Respiratory syncytial virus, or RSV, is an extremely common respiratory virus, but it can sometimes lead to serious illness for newborns and infants. In this episode, we cover what parents and birth professionals know about RSV and the options available for prevention. Dr. Rebecca Dekker and Dr. Sara Ailshire walk through the basics of RSV, including how it spreads, why some infants become seriously ill, and how RSV patterns change throughout the year. They also discuss the history of RSV vaccine development and explain how advances in research led to the prevention options available today for children, adults, and birthing people.

Oct 14, 2026

Ableism shapes birth, parenting, and even the ways our society values whose lives matter. In this replay episode, Dr. Rebecca Dekker talks about disability justice in birth and parenting with Stefanie Lyn Kaufman-Mthimkhulu, a Mad, Disabled, multidisciplinary care strategist/worker, educator, psychiatric survivor, healing practitioner, and founder and director of Project LETS. Together, they explore what disability justice is and how it connects to reproductive justice, from the history of forced sterilization to the ways disabled parents are penalized for both accessing and not accessing care. Stefanie also shares how ableism showed up in their own pregnancy, in both medical and alternative care settings, and why everyone who supports birth and parenting needs a basic understanding of disability and mental health. Content warning: We mention self-injury, disability, neuro-divergent, eugenics, reproductive trauma, ableism, epilepsy, seizures, trauma, sexual violence, medical violence, and history of sterilization.

Oct 7, 2026

Acupuncture, acupressure, and breast stimulation are popular natural labor induction methods, but what does the latest research tell us about how well they actually work?

Sep 30, 2026

Migraines during pregnancy can be debilitating, and figuring out how to prevent or manage them can be especially challenging. In this episode, Dr. Rebecca Dekker explores the research on migraines during pregnancy, including why they happen, how pregnancy can affect migraine patterns, and why new or changing headaches should be taken seriously. Rebecca also discusses migraine triggers, medication overuse or "rebound" headaches, and strategies for prevention. Plus, drawing from both the research and her own lifelong experience with migraines, Rebecca shares non-pharmacological comfort measures for coping with migraine pain, from hydration and body work to temperature therapy, acupressure, mindfulness, and more. (04:29) What migraines are and how common they are (11:39) Migraines during pregnancy and postpartum (14:54) When headaches may signal a more serious condition (23:56) Preventing migraines during pregnancy (24:32) Medication overuse and rebound headaches (30:52) Migraine triggers and thresholds (34:22) Non-medication strategies for migraine prevention (46:05) Comfort measures for an active migraine (59:09) Final encouragement, support, and resources For a full list of references, visit ebbirth.com/413. Resources Postpartum Support International: https://postpartum.net/ Call 988 for the Suicide Crisis and Lifeline: https://988lifeline.org/ Hear Her campaign with list of maternal warning signs: https://www.cdc.gov/hearher/maternal-warning-signs/index.html American Headache Society: https://americanheadachesociety.org/ The Headache Hat: https://theheadachehat.com/ Acupressure points for headaches in pregnancy: https://www.youtube.com/watch?v=LNbXWKStr-4 Aculief acupressure device (NOT recommended for pregnancy unless you've reached term, as it may cause contractions): https://finance.yahoo.com/news/aculief-reviews-does-migraine-relief-045700296.html S-shaped massage hook: https://www.bodyback.com/products/body-back-buddy-classic-trigger-point-therapy-self-massage-tool-body-back-company Renpho eye massager: https://renpho.com/collections/eye-massager For more information about Evidence Based Birth and a crash course on evidence based care, visit www.ebbirth.com. Follow us on Instagram and YouTube! Ready to learn more? Grab an EBB Podcast Listening Guide or read Dr. Dekker's book, "Babies Are Not Pizzas: They're Born, Not Delivered!" If you want to get involved at EBB, join our Professional membership (scholarship options available) and get on the wait list for our EBB Instructor program. Find an EBB Instructor here, and click here to learn more about the EBB Childbirth Class.

Sep 23, 2026

An induction may change your birth plan, but it doesn't mean giving up your preferences or your role in the decision-making process. In this episode, EBB's Director of Programs Chanté Perryman talks with team EBB's Jennifer Anderson about how families can prepare for and navigate an induction. A nurse, doula, and childbirth educator, Jennifer's sharing five of her favorite advocacy tips, including asking about outpatient cervical ripening, considering the timing of your induction, exploring monitoring options that support movement, using water for comfort, and understanding the criteria for a failed induction. (01:36) The "Golden Ticket": Taking an Independent Childbirth Class (06:38) Tip #1: Ask About Outpatient Cervical Ripening (13:45) Tip #2: Consider the Timing of Your Induction (22:41) Tip #3: Ask About Bluetooth Fetal Monitoring (28:21) Tip #4: Using Water and Movement During an Induction (31:32) Learning Your Hospital's Policies Before Birth (33:00) Tip #5: Understanding Failed Induction Criteria (42:09) Preparing When an Induction Is Unexpected (49:00) Birth Story: Navigating a Surprise Gestational Hypertension Induction

See all episodes →