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What is the best sleep training method? Is cry-it-out better than Ferber?

Last updated on June 4, 2026

The data does not clearly favor one sleep training method over another. Cry-it-out (extinction), Ferber (graduated extinction), and more gradual ‘fading’ methods all work. The best method is the one parents can follow consistently — the evidence points to parental consistency and infant temperament as the key drivers of success, not the specific protocol.

Evidence Summary

  • Data source: Head-to-head RCTs comparing sleep training methods; systematic reviews of infant sleep interventions

  • Key finding: Gradisar et al. (2016) RCT found cry-it-out and graduated extinction produced similar sleep outcomes with no difference in stress markers or attachment

  • Key finding: All major evidence-based sleep training methods produce improvement in infant sleep within 1–2 weeks

  • Key finding: No method has been shown superior for long-term outcomes — infant temperament and parental consistency likely matter more

  • Caveat: Very limited data on fading/no-cry methods in RCT settings; they may work but have less rigorous evidence behind them

Confidence: High confidence that sleep training works; moderate confidence on method comparisons — head-to-head RCT data is limited.

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