33 WEEKS PREGNANT
The skull stays flexible to help with the journey through birth
Baby this week: about 43.6 cm — head to heel · about 1.9 kg
≈ 43.6 cm — about the size of a pineapple
Illustration enlarged for clarity — the amber marker shows true relative size
Your baby this week
- Skull bones remain soft and separate, allowing them to overlap slightly during birth
- The fetus's immune system continues strengthening with antibodies from the parent
- Space is getting tighter, so movements may feel like slower rolls and pushes rather than sharp kicks
- Bones throughout the body continue hardening, except for the skull
Your body this week
- Swelling in the ankles and feet is common, especially by evening
- Pelvic pressure and mild discomfort can increase as the baby settles lower
This week's tip: If swelling appears suddenly in the face or hands, or comes with a headache, contact your provider promptly — it can occasionally signal something that needs quick attention.
Want the bigger picture — organ development, nutrition, scans and warning signs for this stage? See month 8: Getting ready for the outside.
Sizes and milestones are typical ranges — every pregnancy runs on its own clock. Educational content; your prenatal care team's guidance always comes first.