Third Trimester: Weeks 28-40+

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The third trimester spans weeks 28 through birth and is when your baby grows rapidly.

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources

Bottom line

The third trimester brings many changes. Talk to your healthcare provider about any concerns.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.