Week 4

Posted on February 1, 2010 by admin

Week 4
Your body: The hormones your baby is secreting may cause you to experience the first symptoms of pregnancy which are fatigue, tingling or aching breasts and nausea.

Your baby: Your baby is now an embryo consisting of three different layers. The inner layer, known as the endoderm, will develop into your baby’s lungs, liver, and digestive system. The middle layer, called the mesoderm, will eventually be your baby’s bones, muscles, kidneys, sex organs, and heart. Finally, the ectoderm, or outer layer, will make up your baby’s tissues and organs such as the skin, hair, eyes, and nervous system.

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