Week 5 of Pregnancy
First trimester
Baby is
about the size of a sesame seed
0.125 inches · less than 1 gram
Baby this week
- •Heart begins beating and can be detected on ultrasound
- •Neural tube is closing, forming the brain and spinal cord
- •Three layers of cells are developing into all body systems
- •Amniotic sac is growing and providing cushioning
You this week
- •Missed period (if not already noticed)
- •Breast tenderness and swelling
- •Fatigue and need for extra rest
- •Nausea (may or may not be present yet)
- •Frequent urination
- •Mood swings
- •Food aversions or cravings
This week's tips
- •Schedule your first prenatal appointment if you haven't already
- •Start taking prenatal vitamins with folic acid if you haven't begun
- •Avoid alcohol, smoking, and unpasteurized foods
- •Stay hydrated and listen to your body's need for rest
- •Track your symptoms and menstrual history for your doctor
- •Consider telling your closest family or friend if you need support
Looking ahead
By week 6, your baby's heart rate will be stronger and more detectable. You'll likely have your first ultrasound soon, which is an exciting milestone that makes this pregnancy feel very real.
Get next week's update delivered
We'll send you week 6's update — baby development, tips, and baby-friendly places to discover. Free, unsubscribe anytime.
More free tools
Looking for places to bring baby?
Explore BringBaby