Week Five of Your Pregnancy


Week 5 Info


Yeah!  Period late.  A urine pregnancy test can be accurate as early as within a few days of a missed period in women with very regular, predictable cycles.

Your embryo is about the size of a sesame seed.  He's now made up of three layers (the ectoderm, the mesoderm, and the endoderm) which will later form all his organs and tissues.  

The neural tube - from which your baby's brain, spinal cord, nerves, and backbone will grow - is starting to develop a top layer called the ectoderm.  This layer will also give rise to skin, hair, nails, mammary and sweat gland, and tooth enamel.

The middle layer, the mesoderm, will form his heart and circulatory system.  During this week the hart begins to divide into chambers and starts to beat.  The mesoderm will also form your baby's muscles, cartilage, bone, and subcutaneous tissue.

The third layer, or endoderm, will house his lungs, intestines, and rudimentary urinary system, as well as his thyroid, liver, and pancreas.

While these layers are developing their respective organs the greatest risk for birth defects forming is between 5 and 10 weeks gestational age.  Each organ system has its own period of peak sensitivity.  Avoid any medications unless approved by your physician if possible and any exposures to alcohol, smoke or chemicals.

You may be noticing some early symptoms of pregnancy like mild nausea and breast tenderness.  You may feel suddenly fatigued.  No matter how many naps you are able to get or how long you sleep at night you may still feel extremely tired.  This should begin to pass as you leave the first trimester.  One of the most difficult aspects of early pregnancy is keeping up your light to moderate exercise routine despite the overwhelming fatigue.  It will help in the long run if you are able to continue by helping you to develop the strength and endurance you'll need to manage the extra weight you'll be carrying around.  It may help to prevent some of the aches and pains of pregnancy, and my women find exercise to be a stress reducer.  Exercise can also help you get ready for the physical stress of labor.  Finally, it can be easier to bounce back after you give birth if you've continued some form of exercise throughout the pregnancy.  Choose safe, moderate forms of exercise that you enjoy.  Walking and swimming are good choices for pregnant women.  Also, yoga is a great way to help with keeping your flexibility and core strength.  You'll want to avoid any forms of exercise that involve high impact or may risk you falling or getting bumped.  Skiing, horseback riding, kick boxing and soccer are many forms of activity that I've had to tell patients to avoid during their pregnancy.  Light jogging is acceptable as long as you are wearing good belly support and do not experience extra cramping.

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