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How Big is Your Baby This Week?

Get a sense of your baby's approximate length and weight from conception to birth with our week-by-week averages.
Your baby grows from the size of a tiny seed to a watermelon in just 40 weeks. Weeks 1 to 3

Your due date will be calculated from the first day of your last menstrual period. Conception occurs about two weeks from this day, and that's when you're truly considered pregnant. In just 40 short weeks, your baby will grow from the size of a tiny seed to the size of a plump watermelon.