Pregnancy week by week

Choose your week to see how big your baby is, what is developing, what is changing in your body, and practical tips for that week.

First trimester (weeks 1–13)

The first trimester runs from week 1 to week 13. It is when your baby's major organs, spine and heart form, and when many people feel the most tired and nauseous.

• 🌱 Week 1
• 🌱 Week 2
• 🔬 Week 3
• 🌱 Week 4
• 🌰 Week 5
• 🫘 Week 6
• 🫐 Week 7
• 🍇 Week 8
• 🍒 Week 9
• 🍓 Week 10
• 🟣 Week 11
• 🍋 Week 12
• 🍋 Week 13

Second trimester (weeks 14–27)

The second trimester runs from week 14 to week 27. Nausea often eases, energy returns, your bump starts to show, and you will begin to feel your baby move.

• 🍑 Week 14
• 🍎 Week 15
• 🥑 Week 16
• 🍐 Week 17
• 🫑 Week 18
• 🥭 Week 19
• 🍌 Week 20
• 🥕 Week 21
• 🥭 Week 22
• 🍊 Week 23
• 🍈 Week 24
• 🥦 Week 25
• 🥬 Week 26
• 🥬 Week 27

Third trimester (weeks 28–40)

The third trimester runs from week 28 until birth, usually around week 40. Your baby gains most of their weight, their lungs mature, and your body prepares for labor.

• 🍆 Week 28
• 🎃 Week 29
• 🥒 Week 30
• 🥥 Week 31
• 🎃 Week 32
• 🍍 Week 33
• 🍈 Week 34
• 🍈 Week 35
• 🥬 Week 36
• 🥬 Week 37
• 🥬 Week 38
• 🍉 Week 39
• 🎃 Week 40

Frequently asked questions

How are pregnancy weeks counted?

Pregnancy is counted from the first day of your last menstrual period, not from conception, so a full-term pregnancy is about 40 weeks.

Which weeks are in each trimester?

The first trimester is weeks 1 to 13, the second trimester is weeks 14 to 27, and the third trimester is week 28 until birth.

When is a baby considered full term?

A baby born from 37 weeks is considered term. Most babies are born between 37 and 42 weeks.

This page is general educational information and is not a substitute for advice from your doctor or midwife. Every pregnancy is different, and baby sizes are approximate. 2026-11-07