Quick Answer: What is a Week-by-Week Pregnancy Calendar?
A pregnancy calendar shows your baby's development and symptoms for each week from week 1 to week 40.
It helps you track milestones, plan doctor visits, and understand what to expect during each stage of pregnancy. Following your baby’s growth from week 1 to week 40 is an incredible journey divided into three trimesters. Each month brings new developments for both you and your baby. Use this pregnancy week-by-week calculator along with this calendar to understand what to expect.
First Trimester (Months 1-3)
Month 1: Weeks 1-4
Baby's Development
- Conception occurs
- Fertilized egg implants
- Neural tube begins to form
- Heart begins to develop
Your Body
- Missed period
- Breast tenderness
- Fatigue
- Early morning sickness
Important Notes
- Take prenatal vitamins
- Avoid alcohol and tobacco
- Schedule first appointment
Month 2: Weeks 5-8
Baby's Development
- Heartbeat detectable
- Brain and spinal cord develop
- Limbs begin to form
- Size: About 1 inch long
Your Body
- Morning sickness peaks
- Frequent urination
- Food aversions
Important Notes
- First prenatal visit
- Blood tests and screenings
Month 3: Weeks 9-12
Baby's Development
- Major organs formed
- Fingers and toes distinct
- Size: 3 inches long
Your Body
- Sickness may subside
- Energy levels increase
- Belly begins to show
Important Notes
- End of first trimester
- Nuchal translucency scan
Second Trimester (Months 4-6)
Month 4: Weeks 13-16
Baby's Development
- Skeleton hardening
- Sex organs developed
- Size: 4-5 inches
Your Body
- Energy returns
- Weight gain noticeable
Important Notes
- Anatomy scan (18-22 weeks)
Tips for a Healthy Pregnancy
Nutrition
- Folic acid intake
- Balanced diet
- Stay hydrated
Exercise
- Moderate activity
- Prenatal yoga
- Listen to your body
Healthcare
- Attend all visits
- Monitor baby moves
- Discuss concerns
Frequently Asked Questions
How many weeks are in a pregnancy calendar?
A full pregnancy calendar includes 40 weeks, starting from the first day of your last menstrual period (LMP).
What tests happen at 12, 20, 28 weeks?
12 weeks: Nuchal translucency. 20 weeks: Anatomy scan. 28 weeks: Glucose tolerance test.
Essential Pregnancy Resources
Bio-Oil Skincare Body Oil — Stretch Mark Support
Clinically proven formula to help improve skin elasticity as your belly grows.
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