About

Hello, this is Hedgehog Baby Note. Just as a hedgehog cherishes even the smallest strengths of its young, we built this service to help caregivers warmly observe their child's growth and development.

What we offer

• A baby age-in-months calculator based on the birth date
• Developmental observation checklists by age, built from official reference sources
• Play guides and general childcare guides by age
• A guide to choosing baby products by age

Please keep this in mind

Hedgehog Baby Note is not any of the following.

• A medical institution, medical consultation service, diagnostic service, or treatment service
• The official K-DST screening test (this service is not the official K-DST)
• A service that judges "normal" vs. "abnormal" or produces a developmental delay score

The information we provide is a tool caregivers can reference while observing their child in daily life. If you have any concerns or questions about your child's development, please consult a pediatrician or an official infant health checkup provider at any time.

Our approach to privacy

Your child's birth date and development checklist results are never sent to a server. Saving to the browser (localStorage) only happens when you explicitly choose to. See ourPrivacy Policy for details.

Related policy documents

• Medical Disclaimer
• Editorial Policy (Korean only for now)
• Sources (Korean only for now)

Note: our interactive tools (Today's Note, Development Check, Growth Center, etc.) are currently only available in Korean. English versions are in progress.