Week 18
An anatomy scan is often offered between 18 and 22 weeks. It looks at organs, placenta, and fluid. It is a screen, not a guarantee of a perfect outcome.
Length and weight
Length14.2 cm
Weight190 g
Early weeks are crown to rump; later weeks are head to heel. The bar is not a ruler. It is a rough comparison with the average at week 40.
Approximate
Ask your midwife or doctor before you change medicine, herbs, or a birth plan.
Related
The second trimester
Movement becomes a language, and the anatomy scan is a look — not a verdict you have to pass.
Sizes and dates are averages. Feeding and sleep notes follow widely published public-health guidance, including World Health Organization infant-feeding advice and back-to-sleep recommendations. They are not a protocol for your hospital.