02/03/2026
You thought you were getting the hang of this newborn thing…Then Week 5 or 6 arrives.
Cue: late afternoon fussiness, cluster feeding, squirming, and the sudden inability to be put down.
If this is you — take a breath. This stage is *very* common.
What’s Happening at 5–6 Weeks?
Around this time, two big shifts occur:
1️⃣ Relaxin Is Leaving Baby’s System
Relaxin (the hormone that kept baby flexible in utero) begins working its way out of their body. As it decreases:
* Babies may feel a little tighter
* Their bodies may seem less “mouldable”
* You might notice more tension or squirming
From a chiropractic lens, this is when we sometimes see increased muscular tone and tension patterns emerging.
2️⃣ Cortisol Rises in the Evenings
Even tiny babies have cortisol fluctuations. By late afternoon:
* Stress hormones rise
* Fatigue builds
* Their immature nervous system struggles to self-regulate
They don’t yet have the neurological wiring to calm themselves.
So they borrow yours.
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Co-Regulation Is Everything
At 5–6 weeks, babies regulate through *you*.
Your steady breathing.
Your slow movements.
Your calm tone.
When you soften, their nervous system often follows. It’s not weakness — it’s biology.
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What Helped Me (From One Mom to Another)
With my own little one, these were game changers:
✨ Infant Probiotics
Supporting the gut can help during this period of digestive immaturity. A regulated gut often means a more comfortable baby.
🛁 Night-Time Bath Routine
This became our reset button. Warm water:
* Activates the parasympathetic nervous system
* Lowers cortisol
* Provides deep sensory input
Consistency is key. Same time. Same sequence. Dim lights. Predictable rhythm.
Routine builds safety. Safety calms the nervous system.
🐆 Leopard Hold
This classic hold (baby tummy-down along your forearm) provides:
* Gentle abdominal pressure
* Vestibular input
* A soothing containment effect
For overtired, windy, tense babies — it can work beautifully.
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5–6 weeks is a peak fussiness window.
It doesn’t mean something is wrong.
It means your baby is developing.
If crying is excessive, feeding is distressed, or tension seems significant, have baby assessed by a qualified paediatric professional.
But most often?
This is a phase of nervous system maturation.
Dim the lights. Run the bath. Breathe slow. Try the leopard hold.
You’re not failing.
You’re co-regulating a tiny human whose nervous system is still under construction. 🌙
From your family Chiropractor and a fellow Mom,
Dr Michelle Cloete (MTech Chiropractic, PCA, CASA, PainSA)