Fingerprints are fully formed
Baby this week: about 13 cm — crown to rump · about 140 g
≈ 13 cm — about the size of a pear
Illustration enlarged for clarity — the amber marker shows true relative size
Your baby this week
- Unique fingerprints and toe prints are now fully formed
- A layer of protective fat is just beginning to develop under the skin
- The umbilical cord is growing thicker and stronger to support the fetus
- Sweat glands are starting to develop
Your body this week
- Lower back aches can start as posture shifts to accommodate the growing belly
- Some notice a stronger appetite along with specific food cravings or aversions
This week's tip: Sleeping on your side with a pillow between your knees can ease lower back and hip discomfort.
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.