Multiple Pregnancy

Twin & Multiple Baby Development

Development of twins or multiples, from formation to how they grow together in the womb.

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Development Timeline

Weeks 0-40

Overview

Twin and multiple pregnancies are unique - two or more babies developing simultaneously. Twins can be identical (one egg splits) or fraternal (two eggs fertilized). Each type has different development patterns and risks.

Identical twins share a placenta (sometimes) and always share genetics. Fraternal twins have separate placentas and are as genetically similar as regular siblings. The type affects monitoring and delivery planning.

Multiples tend to be smaller than singletons and are often born earlier. They face increased risks of complications like twin-to-twin transfusion syndrome (identical twins only) and growth restriction.

🗓️ Week-by-Week Milestones

Week 5

Multiple heartbeats detectable on ultrasound

Week 8

Two (or more) embryos visible

Week 12

Determine if identical or fraternal (mostly)

Week 20

Anatomy scan checks each baby

Week 28

Growth of multiples monitored closely

Week 34

Twins often delivered by this point

Week 37

Maximum recommended gestation for twins

👀 What to Expect

•Faster belly growth with multiples
•More severe pregnancy symptoms
•More frequent doctor visits
•Specialized ultrasounds
•Babies may be smaller than singletons
•Likely earlier delivery
•May need fertility specialists monitoring

💡 Tips for Parents

✓Multiples pregnancy = high-risk, needs extra monitoring
✓More frequent ultrasounds to track growth
✓Higher chance of C-section delivery
✓Twins usually delivered 36-38 weeks
✓Identical twins share genetic material
✓Fraternal twins are like siblings born together
✓Complications more common with multiples

✨ Amazing Facts

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Fraternal twins run in families, identical don't

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Twins can have different fathers (rare)

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Identical twins have same DNA but different fingerprints

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Multiples are more common with fertility treatments

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Twins can be mirror images of each other