Pregnancy Week 18: Symptoms, Baby Size & What to Expect

Your Baby at Week 18

Your baby measures roughly the size of a bell pepper (5.6 in) and weighs about ~190g. The major developments this week: Baby can hear sounds — your heartbeat, digestion, and voice; myelin coating nerves for faster signal transmission.

Your baby's hearing is developing rapidly — they can hear your heartbeat, your voice, and even loud external sounds.

Symptoms at Week 18

Common symptoms during week 18 of pregnancy include: May feel first movements (quickening) — especially if this is your second+ pregnancy; dizziness when standing quickly; increased appetite.

Remember that every pregnancy is unique — you may experience all, some, or none of these symptoms. If anything feels unusual or concerning, don't hesitate to contact your healthcare provider.

📖 Also read: Pregnancy Week 28 Third Trimester | Best App Pregnancy Tracker

What to Do This Week

Start talking and singing to your baby! They can now hear your voice and will recognize it after birth. Studies show babies prefer voices they heard in the womb.

Nutrition & Wellness

Staying well-nourished is crucial at every stage of pregnancy. Focus on folate-rich foods (leafy greens, lentils, fortified cereals), iron (lean meats, beans, spinach), calcium (dairy, fortified plant milks), and omega-3 fatty acids (salmon, walnuts, flaxseed). Stay hydrated with at least 8-10 glasses of water daily.

Frequently Asked Questions

Is it normal to feel [symptom] at week 18?

Yes, most symptoms at week 18 are completely normal. Common experiences include May feel first movements (quickening) — especially if this is your second+ pregnancy; dizziness when standing quickly; increased appetite and fatigue. However, contact your doctor if you experience severe pain, heavy bleeding, or persistent vomiting that prevents you from keeping fluids down.

How big is my baby at 18 weeks?

At week 18, your baby is approximately the size of a bell pepper, weighing about ~190g. Baby can hear sounds — your heartbeat.

What should I avoid at week 18 of pregnancy?

Continue avoiding alcohol, raw/undercooked meats and fish, unpasteurized dairy, high-mercury fish (shark, swordfish, king mackerel), deli meats unless heated until steaming, and limit caffeine to under 200mg per day.