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Pregnancy week 18
Pregnancy Week 18

Pregnancy Week 18

Baby Development

Your baby is around five and three-quarters in length from head to buttock, which is also called crown-rump length. The baby is 8 1/3 inches long if you go by crown-heel measurement. The baby weighs around 220 gm or 8 ounces during this time. Now the baby is practicing sleeping ability and developing an internal clock to monitor it. The baby starts producing myelin, an amalgam of fat and protein that separates and protects the brain, the spinal cord, and the nervous system. Though still developing, the baby’s reproductive system is developed enough for the Doctor to determine sex accurately. The baby would also start kicking during this time to announce its presence.

Changes in mother

By this time, you will be showing your cute baby bump. People would now have the urge to come and touch your belly. Gently remind people not to do that if you find their touch uncomfortable. Also, remember the size of the baby bump varies from mother to mother and from external conditions like your height, weight, and whether it’s the first child. There would be back pain as your increase in the uterus shifts your center of gravity. Relaxin is a pregnancy hormone secreted at these that relaxes the joints and ligaments. Relaxation of the ligament and joints connecting the pelvis to the spine further aggravates the back pain.

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Note: This calculation is based on Naegele's rule.

Pregnancy Week 18 symptoms

There are some different symptoms that the mother might feel at this time which are listed below

  1. Cramps:- There would typically be cramps, particularly in the leg area
  2. Bleeding gum:- The gums in the mouth had become weak and might start to bleed
  3. Swelling:- There might be swelling in the legs
  4. Low blood pressure:- it can cause you to feel faint and dizzy
  5. Headaches and Backaches:- Headaches and Backaches are common during this time. Do try simple yoga to help with them. Remember not to do any posture that would strain your back excessively.

Important Tips

What to do

  1. keep your feet elevated as it reduces pain. Having a long and warm bath will also help alleviate pain
  2. Have smaller meals that you can eat slowly. Sit for an hour or two after food to help you digest
  3. Do try simple yoga to help with them. Remember not to do any posture that would strain your back excessively.

What to avoid

  1. Avoid spicy food as that can make you feel heartburn
  2. Avoid any strenuous exercise.

When to Consult a Doctor

  1. It’s better to search and find a capable pediatrician for your child.
  2. If you have any new symptoms or pain that is unbearable.


At 18 weeks, the mother would have got a cute baby bump, and the baby would have started kicking. The baby is now 8 ounces in weight and 8 1/3 inches in length from head to heel. The mother would have cramps, low blood pressure, swelling, and bleeding gums. Keep your feet elevated, have small meals, and avoid spicy food.

  1. N H S
  2. Healthdirect Australia
  3. The Cleveland Clinic
    Fetal Development 
  4. The Mayo Clinic
    Fetal development
  5. Women Health
    Pregnancy: Stages of pregnancy


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