The neck lengthens and the chin lifts off the chest
Baby this week: about 8.7 cm — crown to rump · about 43 g
≈ 8.7 cm — about the size of a lemon
Illustration enlarged for clarity — the amber marker shows true relative size
Your baby this week
- The neck is more defined, letting the head lift off the chest
- Fine, downy hair called lanugo begins covering the skin
- The liver and spleen are actively producing red blood cells
- The kidneys are making urine, which becomes part of the amniotic fluid.
Your body this week
- A visible bump often starts becoming noticeable to others around now
- Skin changes like a faint dark line down the belly (linea nigra) can appear
This week's tip: Loose, comfortable clothing and supportive bras can help as your body starts changing shape more noticeably.
When to get help now
Call emergency services now or go to an emergency department now if you have sudden, severe tummy pain, pain in the tip of your shoulder, feel very weak, faint or dizzy, or have heavy bleeding that soaks a pad soon after putting it on. For lighter bleeding or spotting, or pain low down on one side, contact your doctor, maternity unit or an early pregnancy unit today.
Sizes and milestones are typical ranges — every pregnancy runs on its own clock. Educational content; your prenatal care team's guidance always comes first.