4 Weeks Pregnant – Your Body and Your Baby

4 Weeks Pregnant | Symptoms and Your Baby

At 4 weeks pregnant this is the week your period is due or even late. You may begin to suspect you are pregnant and experience some symptoms of early pregnancy.

At 4 weeks pregnant, your egg is now well attached to the inside wall of your uterus and has become an embryo. The placenta is still developing, but it is sending out tiny little hair-like tendrils, which wrap around the abundant small blood vessels in the lining of your uterus.

In normal circumstances, your blood and the blood of your baby do not mix. You both have a separate circulatory system. Exchange of oxygen, nutrients and waste products is made possible due to the closeness of your blood vessels to the blood vessels of the placenta.

The next 6 weeks are a really critical stage of development for your baby as their organs begin to develop and some will begin to function. You may not be a smoker but exposure to cigarette smoke has been linked with increased risk of miscarriage.

If you have an indoor cat, it is best to avoid changing kitty litter due to a parasite that can be found in some cats’ feces. This parasite causes toxoplasmosis and can cause serious health problems for your baby.

4 Weeks Pregnant – Your Body

You may have heard that it is important to get enough folate during pregnancy to help the neural tube develop properly and prevent a major birth defect, spina bifida, from occurring by up to 70%.

Most pregnancy supplements include the synthetic form (folic acid) and dietary sources include dark leafy greens, fruits, nuts, eggs, meat and chicken and grains. Spinach, yeast and asparagus have some of the highest levels of folate.

It’s important to note that 1 in 4 people will have problems converting synthetic folate. A MTHFR gene mutation affects 1 in 4 people seriously and 1 in 2 mildly. One form of the mutation results in a 40% to 60% decreased ability to produce the body’s most active form of folate. The best supplement to take instead of folate is folinic acid, especially if you’ve had problems with fertility, pregnancy complications or miscarriage. A simple test for MTHFR may give you some answers, so don’t hesitate to ask your doctor. You can read more about MTHFR here.

4 Weeks Pregnant – Your Baby

At 4 weeks pregnant, your baby is now classed as an embryo.

He or she has made the journey to your uterus, and has embedded in the rich lining of the uterine wall, dividing into two groups of cells. One group of cells has become the embryo and the other has become the placenta. The placenta is truly an impressive support system for your baby. Read our article, 10 amazing placenta facts.

The heart and circulatory system rapidly form. The neural tube also forms in the first 4-6 weeks of pregnancy and will develop into the brain and spinal cord.

At 4 weeks pregnant your baby is 1mm long and about the size of a poppy seed.

Here are some articles that may be helpful if you’re 4 weeks pregnant:

Last Updated: November 15, 2016


Kelly Winder is the creator of BellyBelly.com.au, a writer, doula (trained in 2005), and a mother of three awesome children. She's passionate about informing and educating fellow thinking parents and parents-to-be, especially about all the things she wishes she knew before she had her firstborn. Kelly is also passionate about travel, tea, travel, and animal rights and welfare. And travel.

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