Your baby starts out as a fertilized egg, no bigger than the period at the end of this sentence. The baby will change and grow almost every single day and your body will change and grow, too. It will take 280 days (9 1/3 calendar months or 40 weeks) before the baby is fully developed and is ready to live outside your uterus (womb). Pregnancy is often divided into three periods called trimesters. Each trimester is roughly three months long
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