Between weeks 18 and 22, you'll have one of pregnancy's most important appointments: the detailed ultrasound, also known as the anatomy scan. Unlike the quicker early scans, this one usually takes thirty to sixty minutes, as the sonographer or doctor examines your baby organ by organ.
What the Anatomy Scan Checks
This scan aims to confirm that your baby's development is on track, and typically includes:
- Growth measurements: skull, abdomen, and thigh length, compared against normal ranges for gestational age.
- Examination of the brain, spine, heart, kidneys, stomach, and limbs to confirm proper formation.
- Placenta position, to check it isn't covering the cervix.
- The amount of amniotic fluid surrounding the baby.
- The baby's heart rate and rhythm.
In most cases, results come back completely normal, and this scan is more often reassuring than worrying. If the doctor notes something needing follow-up, it's usually something that can simply be monitored rather than requiring immediate action — babies keep developing, and some measurements just need a later scan to confirm.
You can bring your partner or a family member to share this moment — many mothers describe this appointment as the first time pregnancy felt truly real and tangible.
