A–Z Glossary

teratogen

A teratogen is an exposure that can interfere with normal fetal development and cause harm.

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Which trimester is most important

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 […]