16 weeks pregnant
At 16 weeks pregnant, your baby is about the size of an avocado: around 11.6 cm crown to rump and 100 g. The eyes can make small, slow movements.
Your baby at 16 weeks
The eyes can make small, slow movements.
| Size | About the size of an avocado |
|---|---|
| Length | 11.6 cm crown to rump |
| Weight | 100 g |
Your baby's eyes can now make small, slow movements behind the closed lids, and the face can make different expressions. The back muscles are getting stronger, so your baby can straighten up more. The nervous system is developing quickly, and your baby can grip with its hands. Some women, especially those who have been pregnant before, feel the first gentle flutters around now.
How far along are you at 16 weeks?
At 16 weeks pregnant you are in the fourth month of your pregnancy and the second trimester. You have about 24 weeks to go until your due date. Doctors count pregnancy from the first day of your last period, not from conception, so at 16 weeks your baby has been growing for about 14 weeks. Not sure of your dates? Use our due date calculator.
Your body at 16 weeks
Many women feel their best in the second trimester. Appetite returns and your bump starts to show.
Common symptoms at 16 weeks
Every pregnancy is different, and you may have some, all or none of these.
- Backache. Your growing bump changes your posture and loosens your joints.
- Constipation. Still common in mid-pregnancy.
- The pregnancy glow. Extra blood flow and oil production can make skin look brighter.
- Forgetfulness. Many women notice baby brain. Lists and phone reminders help.
- Varicose veins. Swollen veins in the legs can appear, and often improve after birth.
- First flutters. Feelings like bubbles or a fish swimming, if you are lucky.
Your checklist for week 16
- Go to your 16-week check-up. Your doctor will usually go over your blood test results and check your blood pressure and urine.
- Ask about the whooping cough (pertussis) vaccine. It can be given from 16 weeks, ideally by 32 weeks; in the US it is given between 27 and 36 weeks.
- Avoid heavy lifting. Bend your knees and keep your back straight when you lift.
- Swap high heels for flat, supportive shoes.
- Check your health insurance's maternity cover and any waiting periods.
Tip of the week: Look after your back
Stand tall, sit with your back supported and a cushion behind your lower back, and avoid standing for long periods. Swimming, walking and pregnancy yoga keep back muscles strong. A warm (not hot) bath or a gentle massage can ease aches. Sleeping on your side with a pillow between your knees takes pressure off your hips and back.
For your partner
Energy often returns, so it's a good time to plan.
- Plan a short trip or day out
- Research your hospital and costs
- Start the baby-name shortlist
When to call your doctor at 16 weeks
Contact your doctor, midwife or maternity unit the same day if you have:
- Severe back pain that comes and goes in waves, or back pain with fever or pain when you wee.
- Bleeding or fluid leaking from the vagina.
Call your doctor or hospital straight away for bleeding, severe pain, fluid leaking, severe headache or vision changes.
Questions about 16 weeks pregnant
Is the whooping cough vaccine safe in pregnancy?
Yes. It is recommended in every pregnancy. The antibodies you make pass to your baby through the placenta and protect them in the first weeks of life, before they can have their own vaccines. Whooping cough can be very serious for newborns.
Is it safe to fly at 16 weeks?
For most women with a healthy pregnancy, yes. Airlines usually let you fly without a letter until about 28 weeks, then ask for a doctor's letter. Most stop pregnant women flying after 36 weeks, or 32 weeks with twins. Check your airline's rules before booking.
Why do I keep forgetting things?
Many pregnant women notice they are more forgetful. Hormones, poor sleep and having a lot on your mind all play a part. It is temporary. Write things down and use phone reminders.