What is melatonin?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Melatonin is a hormone released mainly in darkness that signals to the body that it is night-time and helps regulate sleep. Babies begin producing melatonin in a regular daily rhythm at around 2 to 3 months.

Key takeaways

  • Light at night suppresses melatonin; darkness helps release it.
  • Breast milk contains more melatonin at night than during the day.
  • Melatonin supplements are not recommended for babies unless prescribed by a doctor.

What you can do

  • Keep evenings dim and nights dark.
  • Let your baby see daylight during the day to set the body clock.

Share this post