You can usually start formal sleep training when a baby is around 4–6 months old, once they are developmentally ready and your pediatrician agrees it is safe.

Key age guidelines

  • Many pediatric sleep experts say most babies are ready for sleep training around 4 months , when sleep cycles mature and circadian rhythm starts to kick in.
  • Some specialists prefer waiting until about 5 months , after the big 3–4 month developmental shift, because sleep training often goes more smoothly then.
  • Sleep training is generally not recommended for newborns ; they need frequent feeds, have short sleep cycles, and cannot self-soothe reliably yet.

Signs your baby may be ready

  • Age is at least 4–5 months and weight gain has been steady as confirmed by a doctor.
  • Baby can go longer stretches at night without feeding and your pediatrician is comfortable with fewer night feeds.
  • Daytime naps and bedtime are somewhat predictable, even if still short or inconsistent.

Night vs nap sleep training

  • Many experts recommend starting with night sleep first and letting naps improve later, since nights are typically easier to consolidate.
  • Nap-focused training is usually suggested after 5 months , once night sleep is more settled.

Different expert viewpoints

  • Some pediatricians: okay to start around 4 months if baby is healthy, in a safe sleep environment, and no longer needs frequent night feeds.
  • Some sleep consultants: prefer 5+ months as the “sweet spot,” especially after the 4‑month regression passes and melatonin rhythms are more stable.
  • Many agree: exact timing should be individualized , not just based on the calendar, and coordinated with your baby’s doctor.

Safety and prep checklist

  • Confirm with your pediatrician that your baby is ready and doesn’t need regular night feeds for medical reasons.
  • Make sure you have:
    • A consistent bedtime routine (same order every night).
    • A safe sleep space (firm mattress, no loose bedding, baby on back).
    • Agreement between caregivers on which method to use and how long to stick with it.

TL;DR: Most babies are ready for sleep training somewhere between 4 and 6 months , with many experts favoring closer to 5 months, but the “right” time is when your baby is developmentally ready and your pediatrician gives the green light.

Information gathered from public forums or data available on the internet and portrayed here.