Newborn overtired and can't settle: why, and what to do

What's probably happening

Past their wake window (45–90 minutes at this age), stress hormones kick in. The baby looks energised but is past the point of self-settling. Crying escalates fast, and the usual tools stop working.

Overtiredness builds through the day — each short or late nap stacks into sleep debt. Evening settles are the hardest.

When to escalate

If you need a break:

• Put the baby on their back in the cot (crib). Step out for 5 minutes. Hand over to a partner if one is in the house. Frustration carries.

Get immediate medical care:

• Fever > 38°C in a baby under 3 months.
• Crying nonstop for 2 hours despite the steps above.
• A high-pitched, weak, or unusual cry that's different from their usual.