Week 17: Your Baby is the Size of a Pear
Your cardiovascular system is undergoing dramatic changes with increased blood volume. You may feel your heart beating faster or stronger. Balance may be slightly off as your centre of gravity shifts with your growing bump.
Your baby at week 17
🍋
Size of a Pear
Baby Development
Fat stores are beginning to develop under the baby's skin, which will help with temperature regulation after birth. The umbilical cord is growing thicker and stronger. Sweat glands are starting to develop. The baby's skeleton is changing from cartilage to bone, and their unique set of fingerprints are now well established.
Week 17 Highlight: Your baby's body is now starting to accumulate brown fat, which will keep them warm after they are born!
Common Symptoms
Tips for Week 17
Drink plenty of water to help with increased sweating and prevent UTIs.
Rise slowly from sitting or lying positions to avoid dizziness.
Wear breathable cotton underwear to stay comfortable.
Continue prenatal vitamins and eat a variety of fruits and vegetables.
South Africa Specific Info
Urinary tract infections (UTIs) are common in pregnancy and can lead to complications if untreated. If you experience burning during urination, frequent urination with small amounts, or cloudy urine, visit your clinic immediately. UTI treatment is available free at all public clinics in South Africa.
All Pregnancy Weeks
Frequently Asked Questions
About the Author
Due Date Calculator SA Editorial Team
Our content is reviewed by healthcare professionals familiar with South African maternal health practices. We combine evidence-based medical information with local knowledge to support South African mums throughout their pregnancy journey. Our team includes contributors with backgrounds in midwifery, obstetrics, and maternal health education.
Last reviewed: February 2026