Sleep patterns often shift again here
Why steady sleep can change just as it settles
By The Millie's Team · Parenting Notes
Around week sixteen, just when things start feeling steadier, another change can arrive. These adjustments are part of how sleep matures over time.
What is happening
Your baby's sleep is becoming more like adult sleep, with clearer cycles and lighter stages between them. The transitions between these stages can wake your baby more easily than before. This is sometimes noticed as more frequent night waking or shorter naps.
Is this normal
Yes. This shift is one of the most common at around four months. It is not a sign that you have done anything wrong, and it is not permanent. It is a developmental change, not a setback.
What you may notice
- More waking between sleep cycles at night
- Shorter naps, often around forty minutes
- A baby who needs more help to resettle
- Sleep that feels harder for a few weeks
What helps right now
- Keeping a calm, familiar lead up to sleep
- Offering closeness and feeds when needed without worrying about habits
- Going to bed earlier yourself when you can
- Sharing nights where possible so no one carries them alone
What to expect next
For most babies, this stretch settles within a few weeks as the new sleep pattern becomes more established. Many families find that sleep then becomes more predictable than before, even if it looks different. The wobble you may be in now is a sign of growth, not of going backwards.