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how to find out how old is the baby exactly
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The conventional way is to date the baby from the first day of the last normal menstrual bleed. In actual fact, ovulation does not occur until the middle of that menstrual cycle (about 14 days before the first missed menstrual period), so the gestational age (since conception) is two weeks less than the doctor's conventional way of saying it. Another way is to have a first trimester ultrasound, which will give an age to within a few days, again expressed conventionally from the last mesntraul period, unless specified as gestational age.
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