Medical Sources

All calculators and content are based directly on the official medical organizations, peer-reviewed studies, and standards listed below. Each calculator page also cites the specific formula or range it uses.

Reference list

• American College of Obstetricians and Gynecologists (ACOG) (United States)

  Due date dating, prenatal care timing, weight gain recommendations (IOM/ACOG joint), exercise, and high-risk pregnancy management.

• Mayo Clinic — Pregnancy Week by Week (United States)

  General source for week-by-week fetal size, maternal changes, and complication explanations.

• National Health Service (NHS) — Pregnancy (United Kingdom)

  UK standard guidance for pregnancy, prenatal care, and labor signs.

• Centers for Disease Control and Prevention (CDC) (United States)

  Vaccinations (Tdap, hepatitis B), breast milk storage, gestational diabetes, and pregnancy safety guidance.

• World Health Organization (WHO) — Child Growth Standards (Global)

  Source for the 0–5 year WHO Growth Standards Z-score tables used by the percentile calculator.

• Institute of Medicine / National Academies (IOM/NAM) (United States)

  Original guideline for recommended pregnancy weight gain ranges (singleton and twins).

• 대한산부인과학회 (Korean Society of Obstetrics and Gynecology, KSOG) (Korea)

  Korean standards for gestational diabetes, anatomy scan, and screening protocols.

• Wilcox AJ et al. — NEJM 1999 (Research)

  Implantation and hormone kinetics study used for pregnancy test timing (NEJM 1999).

• Hadlock FP et al. — Radiology 1985 (Research)

  Original paper for the Hadlock-4 fetal weight estimation formula (BPD, HC, AC, FL).

• CDC ABM (Academy of Breastfeeding Medicine) — Storage Protocol (United States)

  Breast milk storage protocol for room temperature, refrigerator, and freezer.

Disclaimer

Babymetric is not a medical organization or provider. The site does not provide medical advice, diagnosis, or treatment. All results are reference estimates. Individual medical decisions should be made with your obstetrician, pediatrician, or other qualified clinician.