Week 13 Size: Lemon
About the size of a juicy lemon.
Relative Visual Scale
Solid circle represents your baby's size. Dotted circle shows the full-term week 40 size threshold.
Baby's Development
This is the final week of the first trimester. The baby has unique fingerprints! Vocal cords are beginning to form, and the intestines are moving from the umbilical cord into the abdomen.
Weekly Milestones
- ✦ End of Trimester 1
- ✦ Fingerprints Formed
Your Body & Symptoms
Your energy levels are returning, and nausea is fading. Your libido might increase. The risk of miscarriage drops significantly after this week.
Common Symptoms this Week
Doctor & Care Recommendations
- ✓ Start looking into maternity clothes or belly bands.
- ✓ Discuss a birth plan draft with your partner.
- ✓ Enjoy the boost in energy; do some light nesting or plan a babymoon.
PregWeeks
CHECKLISTUltimate Hospital Bag & Birth Plan
Print-Ready PDFThe Ultimate Hospital Bag Checklist & Birth Plan PDF
Prepare for labor with confidence. Our doctor-reviewed checklists ensure you don't forget any newborn or partner essentials in the hospital delivery room.
- ✓ Clinical OB-GYN Approved List: Separate checklists detailing exactly what mom, partner, and newborn baby require for a standard 3-day recovery stay.
- ✓ 10-Second Birth Preference Builder: Minimalist visual plan templates designed to help delivery nurses digest your labor choices instantly on check-in.
- ✓ 1-Click Offline Access: High-resolution, print-ready document formatted to download directly to your mobile device for offline reference in the clinic.
Weekly Health Guides & Resources
First Trimester Guide
Read comprehensive clinical milestones, screening checklists, and developmental guidelines for this phase.
Track & Relieve Symptoms
Learn why symptoms occur, home remedies, and clinical indicators for this week:
Food Safety Checklists
Verify safety statuses, listeria and mercury risks, and safe alternatives for:
Frequently Asked Questions: Week 13
Evidence-Based Clinical Sources for Week 13
PregWeeks is dedicated to medical transparency. Every milestone, symptom tip, and fetal development guideline for Week 13 is sourced directly from clinical guidelines published by leading obstetric authorities. Read more about our editorial methodology on our Medical Sources page.
Nutrition During Pregnancy FAQ
ACOGPatient and practitioner reference guidelines on prenatal nutritional intake, including essential vitamins, iron, calcium, and weight thresholds.
View Clinical Guideline ↗Early Pregnancy Loss (Practice Bulletin No. 200)
ACOGClinical guidelines on diagnostics, physical symptoms, and care options during early pregnancy challenges in the first trimester.
View Clinical Guideline ↗Food Safety for Pregnant Women
FDA / CDCStandard warnings and food safety guidelines regarding Listeria, Salmonella, and mercury levels in seafood during gestation.
View Clinical Guideline ↗Get weekly pregnancy updates
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