Week 15: Your Baby Can Sense Light
Even with eyelids still fused shut, your baby's eyes are developing the ability to sense light filtering through, and bones are hardening throughout the body.
Baby's Development
Although your baby's eyelids remain fused closed for protection, the eyes themselves are developed enough to sense light. If you shine a bright light on your belly, your baby may even react by moving away from it.
Bones throughout your baby's body are continuing to harden from softer cartilage, particularly in the legs, arms, and skull. Your baby's legs are now longer than the arms, a proportion shift from earlier weeks when arms led the growth.
Taste buds are forming, and although your baby can't truly "taste" amniotic fluid the way we understand taste, some research suggests flavors from your diet can subtly reach the amniotic fluid, possibly influencing early taste preferences after birth.
Changes in Your Body
Your uterus is now roughly the size of a large grapefruit to small cantaloupe. Many women feel noticeably more energetic this week, and your bump is becoming more apparent, especially in form-fitting clothing.
You might notice a line forming down the center of your abdomen — the linea nigra — caused by hormonal pigmentation changes. This typically fades after pregnancy.
Common Symptoms
This week, you may notice:
- Improved energy levels
- A more defined bump
- Mild back discomfort as your center of gravity shifts
- Increased appetite
- Occasional dizziness, especially when changing positions quickly
- Gum sensitivity or mild bleeding when brushing
Nutrition This Week
Calcium and vitamin D remain important for your baby's developing bones. Dairy products, fortified plant milks, leafy greens, and safe sun exposure (or a supplement, if recommended) all contribute.
If you're experiencing increased appetite, focus on nutrient-dense snacks like Greek yogurt, nuts, fruit, and whole-grain crackers rather than relying solely on processed options.
Safe Exercises
As your bump grows, posture-focused exercises can help offset the postural changes pregnancy brings. Gentle back stretches, pelvic tilts, and supported squats can ease lower back strain.
Medical Checklist
This week, consider:
- Asking your dentist about safe dental care during pregnancy if you notice gum sensitivity
- Continuing to track fetal growth and symptoms for upcoming appointments
- Reviewing your hospital or birth center registration paperwork if you haven't started
Doctor Visit Guide
If you opted for additional genetic screening like amniocentesis, it's typically offered between 15 and 20 weeks for those at higher risk or who specifically request it. This is a personal decision to discuss thoroughly with your provider.