Quick Summary — Pregnancy Week 1 (1st Trimester) At 1 weeks pregnant, your baby is approximately the size of a — (—, —) with 273 days remaining until your estimated due date.

🧒 Baby Development

Fertilization occurs. The sperm meets the egg, forming a zygote. Cell division begins immediately — the first 24 hours of a remarkable 40-week journey.

🤰 What Mom Is Feeling

You won't feel any symptoms yet. Your body is just beginning to prepare. This is technically calculated from the first day of your last menstrual period.

💡 Tips for This Week

Start taking prenatal vitamins with 400mcg folic acid if you haven't already. Avoid alcohol and limit caffeine to 200mg/day.

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