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Sleep regressions by age
| Regression | Usual age | What is going on |
|---|---|---|
| 4 month sleep regression | 3-5 months | Sleep matures into adult-like cycles. More night wakings and 30-45 minute naps. |
| 8 month sleep regression | 8-10 months | Crawling, pulling up and separation anxiety collide. Often with the 3 to 2 nap switch. |
| 12 month sleep regression | 11-13 months | Nap refusal around the first birthday. Usually not a sign they are ready for one nap. |
| 18 month sleep regression | 17-19 months | Big feelings, "no!", molars and separation anxiety. Bedtime gets harder. |
| 2 year sleep regression | 23-26 months | Fears, stalling, big-bed moves and new siblings. Bedtime turns into a negotiation. |
Are sleep regressions real?
Honest answer: one of them clearly is, and the rest are patterns parents notice rather than something researchers have measured well.
The 4 month change matches a well-described shift in infant sleep, as babies move toward adult-like sleep cycles. The later "regressions" line up with big developmental steps: crawling and standing, separation anxiety, walking, language, independence. They also tend to coincide with nap transitions, which can leave a baby overtired for a while. Each of those can disturb sleep, and when they pile up at once, families notice.
What helps with any regression
- Check the schedule first. Many "regressions" are a schedule that no longer fits. Compare with the wake windows for their age.
- Use an earlier bedtime on rough days.
- Keep the routine the same, even when it feels like it is not working.
- Practice new skills in the day, so they are less exciting at night.
- Respond the same way each time at night, whatever approach you choose.
- Look after yourself. Take turns with your partner on nights, and nap when you can.
Read the guide for each age
4 month sleep regression
Sleep matures into adult-like cycles. More night wakings and 30-45 minute naps.
8 month sleep regression
Crawling, pulling up and separation anxiety collide. Often with the 3 to 2 nap switch.
12 month sleep regression
Nap refusal around the first birthday. Usually not a sign they are ready for one nap.
18 month sleep regression
Big feelings, "no!", molars and separation anxiety. Bedtime gets harder.
2 year sleep regression
Fears, stalling, big-bed moves and new siblings. Bedtime turns into a negotiation.