Week 16 of Pregnancy
Your baby is about the size of a avocado (11.6 cm)
Your Baby This Week
Development milestones for week 16
At 16 weeks pregnant, your baby has grown to the size of an avocado, measuring approximately 4.5 inches long and weighing around 3.5 ounces. This week brings exciting developments in sensory growth. Your baby's eyes are moving beneath those still-fused eyelids, and the tiny muscles in their face are becoming coordinated enough to produce expressions. Your baby can now make frowning and squinting movements, though these are reflexive rather than emotional. The circulatory system is working efficiently, with the heart pumping about 25 quarts of blood per day. Your baby's limbs are more proportioned now, and their movements are becoming increasingly coordinated. The nervous system is rapidly developing, forming millions of motor neurons that connect the brain to muscles. Your baby is also developing taste buds and may start to taste the amniotic fluid, which changes flavor based on what you eat. The umbilical cord is fully formed and strong.
Your Body This Week
Changes you may experience
At 16 weeks pregnant, your bump is likely becoming more noticeable to others. Many women report this is when coworkers and friends started commenting or guessing. The uterus is now about the size of a grapefruit and sits roughly halfway between your pubic bone and belly button. You might be experiencing that famous "pregnancy glow," caused by increased blood circulation and hormonal changes that give your skin a flushed, dewy appearance. Some women develop melasma, also called the "mask of pregnancy," which appears as dark patches on the face. The linea nigra, a dark line running from your belly button downward, may begin to appear. Your nasal passages might feel more congested due to increased blood flow and hormonal changes. Backaches are increasingly common as your center of gravity shifts. You may notice increased vaginal discharge, which is normal and helps prevent infections.
Tips & Advice for Week 16
Practical guidance from real moms
This week is prime time for maternity clothes shopping if you have not already taken the plunge. Popular and budget-friendly options include Old Navy, H&M, Target, and ThredUp for secondhand finds. Many moms recommend buying pants with full panels rather than under-belly bands, as the full panels feel more secure and comfortable throughout pregnancy. If you are still debating the quad screen or have received concerning results, know that screening tests have high false-positive rates. Do not panic until diagnostic testing confirms any concerns. Start sleeping on your side if you have not already, with a pillow between your knees for hip support. Consider prenatal yoga or swimming to stay active while being gentle on your changing body. Document your bump growth, as many moms treasure these photos later.
Medical Guidance for Week 16
What to discuss with your healthcare provider
The quad screen blood test is typically performed between weeks 15-22, with optimal accuracy around weeks 16-18. This screens for Down syndrome, trisomy 18, and neural tube defects. Remember that abnormal results do not mean your baby has a condition; further diagnostic testing like amniocentesis may be recommended. Schedule your anatomy scan appointment, typically done between weeks 18-22. Call your provider for severe headaches, visual changes, or sudden swelling in your hands and face.
Disclaimer: For educational purposes only. Consult your healthcare provider for personalized medical advice.