Enter your baby's birth date to predict common sleep regression periods and get tips for surviving them.

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About the Baby Sleep Regression Calculator

The Baby Sleep Regression Calculator helps parents predict when their child may go through common **sleep regression phases**. Sleep regressions are temporary but often stressful periods when a baby’s sleep suddenly becomes more disrupted — usually caused by developmental changes, new skills, or emotional milestones.

What Are Sleep Regressions?

Sleep regressions happen when a baby who previously slept relatively well starts waking more often at night, resisting naps, or struggling with bedtime. These phases are a normal part of development and signal that your child’s brain and body are going through rapid growth.

Common Sleep Regression Stages

• Around 4 months — sleep cycles mature, leading to more frequent night wakings.
• Around 8–10 months — new motor skills like crawling and standing may interfere with naps.
• Around 12 months — separation anxiety and learning independence can affect sleep routines.
• Around 18 months — language bursts and growth spurts may disrupt nighttime sleep.
• Around 24 months — toddlers may test boundaries, resist bedtime, or experience vivid dreams.

Why Use This Calculator?

By entering your baby’s birth date, you’ll see the estimated timeline for these common regressions. Knowing when they are likely to occur helps parents prepare mentally, adjust routines, and provide extra comfort. While regressions are temporary, planning ahead can make them easier to navigate.

Note: Every baby is unique. This tool provides general estimates — your child may experience regressions earlier, later, or not at all.