What is the size of my baby during week 4?

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Even though week 4 marks the beginning of the embryonic period, your baby is still very small. The embryo is only about 1/2 to 1 mm long! The tiny embryo already has two layers - the epiblast and the hypoblast -that will eventually develop into organs.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.