Baby sleep regression: ages, signs and what helps

Your baby slept well for weeks, then suddenly wakes often and fights naps. Many parents call this a sleep regression. The sleep regression checker shows whether your baby’s age falls in a commonly reported window.

Commonly reported ages

Guides such as Newton Baby and Wonder Baby mention windows around 4 months, 8 to 10 months, 12 months, 18 months and 2 years. These are parenting guides, not clinical references, and they differ on exact ages and causes.

What parents often notice

• More waking at night, shorter naps.
• Fussier at bedtime, early waking.
• Clinginess, or practising new skills in the cot.

Calm things to try

• Keep your usual routine; familiar steps reassure.
• Give extra daytime play for new skills so practice does not wait until bedtime.
• Check wake windows and the nap schedule in case they need adjusting.
• Follow safe sleep every time (AAP): back to sleep, firm flat surface, empty sleep space.
• Look after yourself. Share nights with the new parent night planner.

If your baby has a fever, seems in pain, feeds poorly or something feels off, check with your pediatrician. Illness and teething can also change sleep.