Your baby this week
Your baby can hear you now! Your heartbeat is your baby's favorite sound — like a lullaby that never stops. Your baby can hear your voice, your tummy rumbling, and even music if you play it. The ears are in their final position now. Your baby is yawning, hiccuping, and swallowing the amniotic fluid all around — practicing for life on the outside. Keep talking and singing; your voice is already a comfort.
Your body this week
Your blood volume is up by 40-50% now. You might feel lightheaded if you stand up too quickly. Leg cramps, especially at night, are common. Baby movements may feel more distinct. Sleep may be more disrupted by discomfort and bathroom trips. Your belly button may be flattening or popping out. These are all temporary — and they all mean things are progressing beautifully.
Common symptoms this week
Every pregnancy is different — you may notice some of these, all of them, or none at all. None of this is a checklist to worry over.
- Lightheadedness on standing
- Night-time leg cramps
- Clearer baby movements
- More broken sleep
- A flattening belly button
This week’s checklist
- Talk and sing to your baby — they can hear you now!
- TIFFA scan is approaching (weeks 18-22) — schedule if not done
- Stretch your calves before bed to prevent night cramps
- Eat magnesium-rich foods (bananas, almonds, spinach)
- Start playing music for your baby
What’s normal this week
Most of what you’re feeling is your body doing exactly what it should — the everyday symptoms don’t need a call. The signs below are the rare exceptions: noticing one doesn’t mean something’s wrong, just that it’s worth a quick check.
When to call your doctor
- Frequent dizziness or fainting
- Persistent leg pain or swelling in one leg (could indicate blood clot)
- Decreased urination despite drinking fluids
This guide offers general information for a typical pregnancy and is not a substitute for personalised medical advice. Always follow your doctor or midwife’s guidance for your situation.
Frequently asked questions
How big is my baby at 18 weeks pregnant?
At 18 weeks pregnant, your baby is about the size of a sweet potato.
What are common symptoms at 18 weeks pregnant?
Common symptoms around 18 weeks pregnant include lightheadedness on standing, night-time leg cramps, clearer baby movements, more broken sleep, a flattening belly button. Every pregnancy is different — you may notice some of these, all of them, or none at all.
What is developing at 18 weeks pregnant?
Your baby can hear you now! Your heartbeat is your baby's favorite sound — like a lullaby that never stops.
When should I call my doctor at 18 weeks pregnant?
Call your doctor at 18 weeks if you notice frequent dizziness or fainting, persistent leg pain or swelling in one leg (could indicate blood clot), decreased urination despite drinking fluids.
Last updated June 2026
References
Ovyacare’s guidance is written in-house and aligned with leading medical authorities: