Fetal development

Which trimester is most important

Why the first trimester usually gets the top answer Most healthcare providers consider the first 13 weeks the most important period for fetal development. This is when embryogenesis and early fetal development are most active, and when major organs and body systems begin forming. The phrase first trimester organ formation is not just a convenient […]

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Baby development month by month during pregnancy

Understanding pregnancy months and gestational age Pregnancy is usually dated from the first day of the last menstrual period, not from the exact day of conception. Because ovulation and fertilization typically occur about two weeks later in a 28-day cycle, a person who is “6 weeks pregnant” may have an embryo that has been developing […]

Baby size and fetal development milestones by trimester

Understanding pregnancy dating and fetal size measurements Pregnancy is usually dated from the first day of the last menstrual period, even though conception typically occurs about two weeks later. This is why a person who is described as 8 weeks pregnant has usually had about 6 weeks of embryonic or fetal growth. Early ultrasound can […]