Pregnancy Guide: Week-by-Week

Mom & Baby's Growth

*Note on Fetal Length: Fetal length figures are derived from the NHS Pregnancy Guide. Please note a shift in measurement standards: babies are measured crown-to-rump (sitting height) until Week 20, and crown-to-heel (standing height) thereafter. This accounts for the significant jump in length numbers around mid-pregnancy.
*Note on Maternal Weight: The weight gain trajectory shown is an estimate based on guidelines from the Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (PMC). This curve reflects the recommended range for a single pregnancy with a normal pre-pregnancy BMI (18.5–24.9). Weight gain goals vary significantly for other BMI categories or multiple pregnancies; please consult your provider for your personalized target.

Detailed Pregnancy Guide

This Week-by-Week Guide has been carefully compiled to offer you a reliable and easy-to-understand overview of your pregnancy journey. To ensure our content is accurate and authoritative, we have integrated information from the world's leading medical institutions and trusted health resources. Our primary sources include:

  • The in-depth fetal development and health guides from the Mayo Clinic and Cleveland Clinic;
  • The official week-by-week pregnancy overview from the UK's National Health Service (NHS);
  • Professional guidelines and standards from the American College of Obstetricians and Gynecologists (ACOG);
  • Official recommendations on weight gain and safety from the U.S. Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (NIH).

⠀Furthermore, to make the information more relatable and practical, we use popular size analogies to help you visualize your baby's growth, while our partner tips are curated to align with current medical advice and supportive care standards. Our mission is to present this expert-backed knowledge in a clear and accessible format, so you can feel confident that the information is both trustworthy and verifiable as you navigate every step of your pregnancy.