GlowCradle

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BIRTH ANATOMY 101: CROWNING, CERVICAL DILATION & TEARING EXPLAINED 👶📏

Mama, this image is packed with info about the most intense part of labor. From 0-10 cm dilation to crowning to perineal tears — understanding the anatomy helps you birth with confidence, not fear. Let’s decode it 👇

**UNDERSTANDING CHILDREN'S BIRTH | THE DILATION JOURNEY**
Cervical Dilation Scale: 0cm → 10cm
- Closed Cervix (0cm): Thick, long, and closed. Like a turtleneck.
- Fully Dilated (10cm): Paper-thin and completely open. Size of a bagel. Baby’s head can fit through. ✅ READY TO PUSH
- What it looks like: The scale shows cervix opening from 1cm to 10cm. For reference, 10cm is about the size of your iris.
- Effacement matters too: Cervix also thins from 3cm long to 0. You need 100% effaced + 10cm dilated to push.

**PELVIC BONES & BABY’S PATH**
What you see: Top view of Pelvic Bones with Fully Dilated Cervix (10cm). Baby’s head engaged in Lower Uterine Segment.
Key anatomy:
1. Pelvic Bones: Form a bowl. Baby must navigate under the p***c bone and around the sacrum.
2. Vaginal Wall: Stretches 300% to let baby through. It’s full of rugae, or folds, that flatten during birth.
3. Lower Uterine Segment: Thinnest part of uterus where C-section incisions are made.

**BIRTH ANATOMY: CROWNING PHASE**
Fetal Head Crowning without incision vs with Episiotomy:
- Crowning: The widest part of baby’s head is visible and doesn’t slip back. This is the “ring of fire.”
- Midline Episiotomy: Straight cut toward a**s. Heals faster but higher risk of extending to 3rd/4th degree tear.
- Mediolateral Episiotomy: Angled cut away from a**s. Less likely to extend to a**l sphincter.
Fact: Routine episiotomy is no longer recommended. ACOG says warm compresses + perineal support + slow delivery of head prevent tears better. Episiotomy is for fetal distress or if baby needs to be out fast.

**BIRTH ANATOMY: DESCENT AND COCCYGEAL ENGAGEMENT**
What you see: Baby’s head deep in pelvis. Your tailbone, or coccyx, moves backward during birth.
Why position matters: Squatting, hands-and-knees, or side-lying lets your coccyx move back. This opens the pelvic outlet 20-28% wider vs. lying flat on your back. Flat on back = sacrum can’t move.

**DEGREES OF PERINEAL TEAR**
1st degree: Superficial skin tear. Stitches may not be needed. Heals in days.
2nd degree: Perineal muscle involvement. Most common. Needs stitches. Heals in 2-6 weeks.
3rd degree: A**l sphincter involvement. Requires repair in OR. Pelvic floor PT recommended.
4th degree: Extension to re**um. Rare, 0.25-2.5% of births. Needs specialist repair + PT.

**3 WAYS TO PROTECT YOUR PERINEUM**
1. Perineal massage: Starting at 34 weeks, 5 min 2-3x/week reduces 3rd/4th degree tears for first-time moms.
2. Warm compress: Ask your nurse or midwife to hold a warm cloth on your perineum during crowning.
3. Slow the head: Panting, not pushing, when you feel burning gives tissue time to stretch. Hands-and-knees position reduces tear risk.

💡 3 FACTS THAT CHANGE YOUR BIRTH
1. You don’t push at 10cm unless you feel the urge: “Laboring down” lets baby descend passively and reduces tearing.
2. Tearing isn’t failure: 85% of first-time moms have some tear. Most are 1st/2nd degree and heal well.
3. Your anatomy is built for this: Your va**na, perineum, and pelvis are designed to stretch and recover.

❤️ FOR POSTPARTUM HEALING
Ice for 24 hrs, then sitz baths. Witch hazel pads, peri bottle, dermoplast spray. Stool softeners are non-negotiable — no straining.
See a pelvic floor PT at 6 weeks if you have pain, incontinence, or pressure.

If you have questions about cervical checks, episiotomy, or tearing prevention, talk to your OB or midwife. For postpartum bleeding >1 pad/hr, fever, foul smell, or pain that’s getting worse, contact your provider immediately. For healing support, a pelvic floor PT is gold.

Your body opens, your baby descends, and you do it. That’s birth anatomy in action 🤍

Save this for your birth plan. Share with a mama prepping for labor.


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