How to Tell If It Is a Regression or Something Else

Not every sleep disruption is a regression. Here is a quick reference:

The One Thing That Helps Every Regression

Consistency. Every regression ends faster when the sleep environment, routine, and response remain predictable. Your baby's nervous system is overwhelmed by new development. The more consistent you are, the faster they find their footing.

Find Your Baby's Stage

Each regression is different, and each age needs a different approach. Our age-specific guides go deep on every method, schedule, and real-life scenario for your baby's exact stage.

Baby Sleep Regression Calendar Every Regression By Month

Baby Sleep Regression Calendar: Every Regression by Month (and How to Survive Each One) Every parent knows the feeling. Your baby was sleeping beautifully. Then, seemingly overnight, everything fell apart. Night wakings returned. Naps shortened. Bedtime became a battle again. You are not doing anything wrong. Your baby is going through a sleep regression, and it is one of the most predictable events in infant development. The good news: every regression has a beginning, a middle, and an end. And you can get through each one without cry-it-out. This is your complete month-by-month sleep regression calendar, covering every major regression from newborn through toddler years, with gentle strategies for each stage. What Is a Sleep Regression? A sleep regression is a period of disrupted sleep that coincides with a developmental leap. When your baby's brain is working overtime to master a new skill, whether that is rolling, crawling, walking, or language, sleep temporarily suffers. Regressions typically last 2 to 6 weeks. They are not permanent, and they do not mean your baby has forgotten how to sleep. They mean your baby is growing. The Complete Sleep Regression Calendar 4-Month Sleep Regression (3.5 to 4.5 months) Why it happens: This is the most significant regression because it is permanent. Your baby's sleep architecture changes from newborn sleep (which is mostly deep sleep) to adult-like sleep cycles with lighter stages. Once this change happens, it does not reverse. What you will notice: - Waking every 45 minutes or 2 hours all night - Short naps (the dreaded 45-minute nap) - Difficulty settling at bedtime - Increased fussiness and clinginess How long it lasts: 2 to 6 weeks Gentle strategies: 1. Introduce a consistent bedtime routine if you have not already 2. Move bedtime earlier by 15 to 30 minutes to prevent overtiredness 3. Work on wake windows: at 4 months, aim for 1.5 to 2 hours of awake time between sleep periods 4. Try the shush-pat method for resettling between sleep cycles 5. Consider a white noise machine to smooth the transitions between sleep cycles Related guide: 3-4 Month Sleep Guide 6-Month Sleep Regression (5.5 to 6.5 months) Why it happens: Your baby is likely learning to sit up, roll both ways, and may be starting solid foods. Brain development is accelerating rapidly. What you will notice: - More frequent night wakings after a period of improvement - Shorter naps or nap refusal - Increased need for comfort and contact How long it lasts: 2 to 4 weeks Gentle strategies: 1. Stick to your established sleep routine even when it feels like it is not working 2. Check wake windows: at 6 months, most babies need 2 to 2.5 hours of awake time 3. Ensure your baby is getting enough daytime calories, especially if starting solids 4. Offer extra comfort during the day to fill the connection cup 5. Avoid introducing new sleep associations during the regression 8-Month Sleep Regression (7.5 to 9 months) Why it happens: This regression is dr