Sources & References

We cite the original published source for every calculator. Each entry below is also linked from the calculator that uses it.

Last reviewed: June 25, 2026

Developmental screening

  • Squires J, Bricker D. Ages & Stages Questionnaires, Third Edition (ASQ-3) User's Guide. Brookes Publishing. agesandstages.com
  • American Academy of Pediatrics. Promoting Optimal Development: Identifying Infants and Young Children With Developmental Disorders Through Developmental Surveillance and Screening. Pediatrics 2020. publications.aap.org
  • Council on Children with Disabilities. Bright Futures recommendations for preventive pediatric health care.

Growth & nutrition

  • World Health Organization. Child Growth Standards (0–5 years). who.int
  • Centers for Disease Control and Prevention. Clinical Growth Charts. cdc.gov

Sleep

  • Paruthi S, et al. Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine. J Clin Sleep Med 2016.

Preterm / corrected age

  • American Academy of Pediatrics, Committee on Fetus and Newborn. Age terminology during the perinatal period. Pediatrics 2004 (reaffirmed).