15/02/2026
🌟 From Conception to Birth: A Week-by-Week Journey
Pregnancy progresses faster than most parents realize—by 4 weeks, your baby's heart has already started beating. Here's a timeline of the incredible milestones from fertilization to full term.
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First Trimester (Weeks 1–12)
🔹 Weeks 1–4
· Fertilization & implantation
· Placenta begins to form
· Week 4: Cardiac activity detectable; neural tube forming
🔹 Week 8
· All major organs initiated
· Limb buds visible
· Crown-rump length (CRL): ~1.5–2 cm
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Second Trimester (Weeks 13–27)
🔹 Week 16
· Skeletal ossification progresses
· Fetal movements begin (though you may not feel them yet)
🔹 Week 20
· Quickening – you may feel those first flutters!
· Lanugo (fine hair) develops
🔹 Week 24
· Surfactant production begins in lungs
· Threshold of viability reached with medical support
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Third Trimester (Weeks 28–40)
🔹 Week 28
· Eyes open
· Brain development accelerates
🔹 Week 32
· Rapid fat accumulation
· Lung maturation continues
🔹 Weeks 37–40 (Full Term)
· Organs mature
· Average birth weight: 2.5–3.5 kg
· Ready to meet the world!
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🩺 Clinical Importance:
· Regular antenatal scans track development
· Folic acid is critical in early weeks
· Kick counting important in 3rd trimester
· Sudden decrease in movements requires immediate evaluation
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👇 Which week of development amazed you the most?
💬 Share below—and tag an expecting mama who needs to see this!
📌 Save this post as your week-by-week reference guide.
⚠️ IMPORTANT: THIS POST IS FOR EDUCATIONAL PURPOSES ONLY. CONSULT YOUR HEALTHCARE PROVIDER FOR PERSONALIZED PRENATAL CARE AND MONITORING.