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Pregnancy Guide·First Trimester

Week 10: Vital Organs Function

Kumquat (~33mm)·Last reviewed: 25 April 2026
Quick answer

At week 10, your baby is about the size of a kumquat. Bones are beginning to harden, kidneys are producing urine, and the brain is producing nearly 250,000 neurons per minute. According to Nuhah's pregnancy guide, this is a period of rapid organ development.

Baby development at week 10

Bones begin to harden (ossification). Kidneys produce urine for the first time. The brain is producing nearly 250,000 neurons per minute. Tiny fingernails are starting to form, and the outer ears are taking shape. The baby can bend their limbs, and the spinal nerves are stretching out from the spinal cord. All vital organs are now formed and beginning to function.

Your body this week

Your uterus is about the size of a grapefruit. Increased blood flow may make your skin look slightly rosier (the pregnancy glow). Some people experience headaches due to hormonal changes and increased blood volume. Constipation and bloating are common as progesterone slows digestion. Round ligament pain (a sharp or stretching sensation in your lower abdomen) may begin as your uterus grows.

Things to do this week

1
Stay hydrated - aim for 6-8 glasses of water daily
2
Eat fibre-rich foods to help with constipation
3
Consider telling close family and friends if you haven't already
4
Start researching your dating scan options

Frequently asked questions

How big is my baby at 10 weeks?

About 31mm (3.1cm), roughly the size of a kumquat. All vital organs have formed and are beginning to function. The brain is in a period of incredibly rapid growth, producing around 250,000 new neurons every minute.

When should I tell people I'm pregnant?

There is no right or wrong time. Many people wait until after the 12-week scan, but some share earlier with close family and friends. It is entirely your choice. Some find early support helpful, while others prefer to wait.

Related reading

Scans & Appointments
Your Dating Scan: What Happens at the 12-Week Scan
Guides
NHS Pregnancy Appointments: The Complete Timeline
Wellbeing
First Trimester Symptoms: What's Normal

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