A–Z Glossary

Ossification

Ossification is the process in which developing cartilage is gradually replaced by bone.

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Key milestones during each month of pregnancy

Key milestones during each month of pregnancy

How pregnancy months relate to weeks and trimesters Pregnancy is commonly divided into three trimesters: weeks 1 to 12, weeks 13 to 27, and weeks 28 to birth. Month-by-month descriptions are approximate because calendar months do not align perfectly with gestational weeks. Clinically, your care team will usually communicate in weeks and days, such as […]