First trimester
Pregnancy Week 5
Your baby is about the size of a sesame seed.
Size
sesame seed
Length
2 mm
Weight
< 0.001 g
Baby in week 5
The neural tube (brain and spinal cord) starts forming. The heart begins as a tiny tube and starts beating.
What you may notice this week
Morning sickness may begin. Frequent urination. Heightened sense of smell.
Tips for week 5
- Eat small frequent meals to manage nausea
- Stay hydrated
- Get plenty of sleep
Tools that pair with this week
Due Date Calculator
Estimate your delivery date by last period or conception date. Naegele’s rule plus cycle adjustments.
Week Tracker
See exactly how many weeks and days pregnant you are, plus your trimester and key milestones.
Contraction Timer
Tap once to start, once to stop. Tracks duration, frequency, and pattern over time.
Ovulation Calculator
Find your fertile window based on your cycle length. Plan or avoid with confidence.
Baby Name Generator
Filter by origin, style, length, and starting letter. Boys, girls, and unisex.
Growth Percentile
Plot your baby’s weight, length, and head circumference against WHO percentile curves.