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6. 4TH WEEK FOETUS

During the fourth week of gestation, the embryo has developed into a blastocyst and has implanted into the uterine lining. The cells within the blastocyst will continue to differentiate into the various tissues and organs of the developing fetus.

At this stage, the neural tube begins to form, which will eventually become the brain and spinal cord. The heart also begins to form and will start to beat soon after. Other organs, such as the liver, pancreas, and lungs, begin to take shape.

5. 16-18 week fetus

What does full-term mean in a pregnancy?

Once you get close to the end of your pregnancy, healthcare providers may use several terms to describe when you go into labor. These terms are labels that divide up the last few weeks of pregnancy.

They’re helpful in determining how likely a baby is to have complications at birth. For example, babies that are born in the early term period (or before it) generally have a higher risk of breathing issues than babies born at full term.

2. FULL TERM FEOTUS WITH ENCEPHALOPATHY

During Pregnancy

During pregnancy, there are screening tests (prenatal tests) to check for birth defects and other conditions. Anencephaly would result in an abnormal result on a blood or serum screening test or it might be seen during an ultrasound (which creates pictures of the body). For more information about screening and confirmatory tests during pregnancy, visit CDC’s birth defects diagnosis web page.