15 Weeks Pregnant: Symptoms, Signs & What Not to Ignore

If you’re 15 weeks pregnant, it is quite a significant milestone in your second trimester. At this stage, many early discomforts start to ease, and you might be noticing subtle changes in your body as your baby grows. If you’re wondering what 15 weeks pregnant in months means, you’re nearly four months along—almost halfway through your pregnancy journey. 

This week, your baby is developing rapidly, and the 15-week foetus size is now comparable to an apple or an orange. As the foetus at 15 weeks pregnant becomes more active and defined, you may start to feel more connected to the life growing inside you. Meanwhile, you might begin to notice some common symptoms at 15 weeks pregnancy such as nasal congestion, mild swelling, or increased energy. 

Understanding the typical 15 weeks pregnant signs and symptoms can help you distinguish between normal bodily changes and signs that require medical attention.  Around this time, your uterus continues to grow, and you may notice your bump becoming more prominent. It’s a wonderful moment to embrace the changes in your body and focus on your prenatal care.  

In this article, we’ll cover everything you need to know—from baby development to symptoms you shouldn't ignore and tips to stay on track with your pregnancy health. 

15 Weeks of Pregnancy Symptoms 

When you're 15 weeks pregnant, many women notice a shift in how they feel, with early discomforts easing and new symptoms emerging. The expanding 15-week of pregnancy belly size can cause visible changes such as a more defined baby bump and mild abdominal stretching. 

Common 15-week pregnancy symptoms include: 

• Nasal congestion, caused by increased blood flow to the mucous membranes 

• Mild headaches or occasional dizziness 

• Indigestion and heartburn due to hormonal fluctuations 

• Visible veins and breast enlargement 

• A feeling of increased energy compared to the first trimester 

In summary, while many symptoms at 15 weeks pregnant are a normal part of your body adjusting to pregnancy, it’s still important to stay aware of any changes and monitor for signs that may need medical attention. Monitoring these changes supports a healthy pregnancy and helps ensure both maternal and foetal well-being as development progresses. 

Baby Development at 15 Weeks of Pregnancy 

•  By the end of the 15th week of pregnancy, your baby’s scalp hair pattern is fully formed and will remain the same for life. 

• Hair growth may begin at this stage, but it typically remains invisible for a few more weeks. 

• The presence of hair in the womb does not guarantee a full head of hair at birth—many babies are born bald and grow hair later. 

• A layer of fine, soft hair called lanugo covers your baby’s entire body. 

• Lanugo acts as a protective layer, shielding the baby’s skin from amniotic fluid and usually disappears before or after birth. 

• Underneath the lanugo, your baby’s skin is thin and translucent, making blood vessels visible as they carry blood. 

• The mouth continues developing, and your baby may already be thumb-sucking. 

• Facial movements become more frequent and more coordinated, showing progress in your baby’s neurological development. 

Your Body & Bump at 15 Weeks Pregnant 

At 15 weeks pregnant, your uterus continues to grow, making your baby bump more noticeable. You may experience changes in posture and mild back discomfort as your body adjusts to this shift. Increased blood flow can lead to skin changes, such as itchiness or the classic pregnancy glow. Around this time, some women begin to feel subtle movements from their baby, though it might still be too early for everyone. You may also find that your clothes start to feel tighter as your body continues to change and prepare for the months ahead. 

15 Weeks Pregnant: Things to Consider 

• Growing Uterus: May cause backaches and change your balance. 

• Round Ligament Pain: Sharp side pains as uterus expands. 

• Itchy Skin: Use unscented moisturiser and wear loose cotton clothes. 

• Baby Movements: Becoming more active and noticeable. 

• Baby’s Hearing: Developing, may respond to sounds. 

• Lanugo: Fine hair covers baby’s skin. 

• Nausea & Heartburn: Eat small meals; avoid spicy/fatty foods. 

• Headaches: Stay hydrated and rest. 

• Nasal Congestion: Use humidifier and elevate head while sleeping. 

• Gum Care: Brush and floss regularly. 

• Weight Gain: Around 5 pounds (2.27 kg) typical. 

• Prenatal Screening: May be offered to check baby’s health risks. 

• Emotional Health: Watch for mood changes and seek support if needed. 

• Hydration & Nutrition: Drink plenty of water; include vitamin C-rich foods like cranberries. 

15 Weeks Pregnant: Questions for Your Healthcare Provider 

At 31 weeks pregnant, it’s important to stay informed about your baby’s development, manage late-pregnancy symptoms, and prepare for delivery. Here are key questions to ask your healthcare provider: 

1. Baby’s Development 

• How is my baby growing and developing at this stage? 

• Is the baby in the head-down position yet? 

2. Symptoms & Health 

• What third-trimester symptoms are normal, and what’s concerning (e.g., swelling, Braxton Hicks)? 

• Is my weight gain and blood pressure on track? 

• How can I manage common discomforts like back pain or sleep issues? 

3. Diet & Lifestyle 

• Should I make any changes to my diet or supplements now? 

• Is it still safe to exercise or travel? 

4. Labour Preparation 

• What are signs of real labour, and when should I go to the hospital? 

• Can we discuss my birth plan and delivery options (vaginal, C-section, pain relief)? 

5. Postpartum & Baby Care 

• What newborn care steps (like vaccinations) should I expect? 

• What should I know about postpartum recovery and breastfeeding? 

These questions will help you make informed decisions and feel more prepared for the weeks ahead. 

15 Weeks Pregnant Checklist 

At 15 weeks pregnant, many women report increased energy levels as they move further into the second trimester. If you are feeling more active, consider light exercise, such as walking or prenatal yoga, or begin planning your baby’s nursery. This renewed energy is one of the more welcome 15 weeks pregnant symptoms. 

However, this stage may also bring mild swelling—known as edema—particularly in the feet, ankles, and hands. This is due to increased blood circulation and pressure from the growing uterus. Given the expanding 15-week foetus size, such changes are common, but they should be monitored. 

Preventive Tips 

• Engage in gentle physical activity.   

• Rest with your legs elevated.   

• Drink plenty of water. 

These practices help manage swelling while supporting the development of the foetus at 15 weeks pregnant, who now measures around 4 inches. The 15-week foetus size reflects significant growth, with increased movement and further organ development taking place. 

If swelling becomes severe or is accompanied by puffiness in the face or eyes, seek medical advice. Knowing the typical 15 weeks pregnant signs and symptoms helps distinguish normal changes from those that may need professional attention. 

Key Takeaway 

At 15 weeks pregnant, both mother and baby undergo important changes as the pregnancy progresses into the second trimester. Understanding the common symptoms and recognising normal signs of development, including the growth and activities of the foetus at 15 weeks pregnant, helps ensure a healthy and well-monitored pregnancy. Staying attentive to your body’s signals and maintaining regular prenatal care will support the well-being of both you and your growing baby during this crucial stage.