Your baby at 18 weeks
The ears and hearing continue developing. The baby moves within the amniotic fluid.
The developing nervous system gradually improves coordination. Movements may become easier to notice.
TRIMESTER 2 · WEEK 18
18 weeks pregnant
A world of tiny movements.
What to expect at 18 weeks pregnant: your baby, your symptoms and this week’s reminders.
Symptoms at 18 weeks pregnant
- You may begin noticing movements.
- Back discomfort or dizziness may occur.
- Sleep may become less comfortable.
None of these symptoms is required. Symptoms alone cannot diagnose pregnancy or establish your baby’s wellbeing.
Change position gradually if you feel light-headed. Seek assessment for fainting or persistent dizziness.
Source for this week: NHS — Week 18
YOUR WEEK, YOUR JOURNEY
Explore another pregnancy week
Choose a week to explore your baby’s development and changes you may notice.
01 · FIRST TRIMESTERSmall beginnings
02 · SECOND TRIMESTERA growing connection
03 · THIRD TRIMESTERGetting closer to meeting
Sources and content note
This is source-based general information, not a substitute for a clinical assessment or individual care plan. The presence, absence or change of symptoms alone cannot establish pregnancy wellbeing. This content is not a personalised care plan reviewed by a healthcare professional.
This guide groups weeks 1–13 in the first trimester, 14–27 in the second, and 28 onwards in the third. Weeks refer to gestational age dated from the last menstrual period; clinical dating may differ.
- NHS — Pregnancy week by week
- ACOG — Fetal development and gestational age
- NHS — Your baby’s movements
- NHS — Pregnancy symptoms
Sources checked: 31 October 2026 · Illustrations are AI-generated conceptual drawings, not ultrasound or diagnostic images.