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Sleep Regression (4-Month, 8-Month, 18-Month)

Sleep regression is when baby who was sleeping well suddenly starts waking frequently. Most common at 4 months (developmental leap + permanent change in sleep cycles), 8-10 months (separation anxiety + new skills like crawling), and 18 months (teething + independence).

4-month regression is permanent shift in sleep architecture. Others usually last 2-4 weeks.

Signs: Increased night waking, shorter naps, fighting sleep, more fussy.

What to Do

  • Stick to your established routine - consistency is crucial during regression
  • Offer extra daytime naps to prevent overtiredness making it worse
  • For 4-month regression: May need to teach independent sleep skills (sleep training)
  • For 8-month regression: Practice new skills (crawling, standing) during day so baby isn't practicing at night
  • Extra comfort is okay - this is developmental, not behavioral
  • Move bedtime earlier temporarily if baby is overtired
  • Avoid introducing new sleep associations (if you didn't rock to sleep before, don't start now)
  • Be patient - most regressions resolve in 2-4 weeks
  • 4-month regression is permanent change - may need new approach to sleep
  • Tag-team with partner - take shifts so each gets some sleep
  • Remember: This is temporary, even though it feels endless

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