Launch pricing - Get £50 off! Just £49.99 your first year. Use code nuhahyearlyLaunch pricing - Get £50 off!
£49.99 your first year, code nuhahyearly
Week by Week
Week 12
First trimester wraps up
Week 20
Anomaly scan
Week 28
Third trimester begins
Week 36
Full term approaches
All 42 weeks
Tools
Due Date Calculator
Baby Name Generator
Kick Counter
Contraction Timer
Ovulation Calculator
Weight Gain Calculator
Chinese Gender Predictor
Baby Size Comparison
Maternity Leave Calculator
Paternity Leave Checker
Baby Cost Calculator
Pregnancy Symptom Checker
Birth Plan Builder
Resources
Pregnancy guides
Hospital bag essentials
Baby names
Hypnobirthing
Browse all
Blog
Braxton Hicks vs real contractions
UK maternity leave explained
Sleep in late pregnancy
All posts
AboutEarn with NuhahContact
Week by Week
Due Date CalculatorBaby Name GeneratorKick CounterContraction TimerOvulation CalculatorWeight Gain CalculatorChinese Gender PredictorBaby Size ComparisonMaternity Leave CalculatorPaternity Leave CheckerBaby Cost CalculatorPregnancy Symptom CheckerBirth Plan Builder
ResourcesBlogPricing
AboutEarn with NuhahContact
Sign In
Pregnancy Guide·First Trimester

Week 7: Brain Growth

Blueberry (~8mm)·Last reviewed: 25 April 2026
Quick answer

At week 7, your baby is the size of a blueberry. The brain is growing rapidly, producing approximately 250,000 neurons per minute. According to Nuhah's pregnancy guide, arm and leg buds are lengthening and nostrils are becoming visible.

Baby development at week 7

The brain is growing rapidly, producing approximately 250,000 neurons per minute. Arm and leg buds are lengthening, and the hands and feet look like tiny paddles. Nostrils and the mouth opening are visible. The appendix and pancreas are developing. Muscles are starting to form, and the embryo may make tiny spontaneous movements, though you will not feel them for many weeks yet.

Your body this week

Morning sickness may be at its most intense. Food aversions and cravings can appear or intensify. You may need to urinate more frequently as your uterus grows and presses on your bladder. Mood swings, tender breasts, and fatigue continue. Your blood volume is starting to increase - by the end of pregnancy it will have increased by about 50%.

Things to do this week

1
Book your dating scan (NHS offers this between weeks 11-14)
2
If nausea is severe and you cannot keep fluids down, speak to your GP - treatment is available
3
Start thinking about who you would like at your birth partner
4
Consider which antenatal classes you might want to attend

Frequently asked questions

What happens at 7 weeks pregnant?

Your baby's brain is developing rapidly and arm and leg buds are growing. The embryo is about 8mm long (the size of a blueberry). You may be experiencing morning sickness, fatigue, and breast tenderness as your body adapts to pregnancy.

When is the dating scan?

The NHS dating scan is typically offered between weeks 11 and 14. It confirms your due date, checks the baby's development, and offers screening for certain conditions. Nuhah's pregnancy tracker will help you keep track of upcoming appointments.

Related reading

Baby Development
When Can You Hear Your Baby's Heartbeat?
Wellbeing
First Trimester Symptoms: What's Normal

Track week 7 and beyond

Milestones, partner sharing, notes, photos, and a curated essentials guide - all free. No app to install.

Get Started - Free
← Week 6Week 8
← All weeks

© 2026 Nuhah. All rights reserved.