By Stephanie Lord-Darby

You just arrived at morning tea with your Parent Group. You’re still figuring out this wild ride called parenthood and even the smallest outing feels like a victory. You made it out of the house—win.

But as you settle onto the rug, your little snuggle-pot in your lap, you notice something: your baby is the only one not lifting their head. Your stomach drops.

Here’s the truth: Noticing differences like this isn’t anxiety. It’s love paying attention. At GymbaROO, we call these “Just Noticeable Differences.” Not labels. Not diagnoses. Just gentle observations. A four-month-old who doesn’t lift their head at all. A six-month-old who feels floppy. A baby who won’t push up on their arms. These are cues, not failures.

The Science: Movement Wires the Brain

Recent brain scans have shown babies process movement and balance information far earlier than we once thought. By just seven weeks, key brain areas are already busy integrating signals from movement and the senses. That means every gentle rock, every cuddle, every playful push-up—even for a minute—helps create the brain’s wiring for learning and moving later on. And you don’t need special equipment or hours of drills. You just need you, your baby, and a few minutes a day.

An expert tip from our Ambassador Occupational Therapist, Sienna Southen:

“Begin supporting your child’s vestibular system from the very start. Gentle, smooth rocking not only soothes your baby but also helps train their inner ear sense, supporting balance, coordination, and nervous system regulation for better outcomes.”

 

Tummy Time—But Make It Gentle

Everyone’s heard about tummy time, but not every baby loves the floor. That’s okay. The magic isn’t in the mat—it’s in the movement.

We explain in our Baby ROO classes that: 

“When a baby has low muscle tone or isn’t lifting their head, it’s not a parenting failure. It’s an underdeveloped body map. The ‘fix’ isn’t drills. It’s weight-bearing through gentle, playful positions. Each time a baby lifts their head against gravity or pushes up through their forearms, their brain draws a brighter line between ‘muscle’ and ‘movement.’”

Try this: Lie back on the couch and place your baby on your chest. Your heartbeat, your smell, your smile—this is tummy time too, and it feels safe.

 

What’s Typical? A Quick Guide

• 1 month: Can briefly lift head when on tummy.
• By 3 months: Begins to control head movements.
• Around 4 months: Gains better control and balance in head, neck, and trunk. Can balance head for short periods.

If your four-month-old isn’t lifting their head at all, that’s a “just noticeable difference”—a sign to keep watching, not a reason to panic.

 

What To Do If You Notice a Delay

If you’re noticing your baby isn’t hitting certain milestones—like lifting their head by four months, feeling especially floppy, or not pushing up on their arms—trust your instincts. Early notice is a strength, not a shortcoming. Here’s what you can do:

• Talk to your GP or child health nurse. They can assess your baby’s development, provide reassurance, and, if needed, recommend early support services.
• Keep a record of what you’re noticing, including when and how often you see these differences. This can help health professionals get the full picture.
• Try gentle movement activities as described above, but don’t feel you need to “fix” things on your own. Support is available.
• Remember: Every baby develops at their own pace, but if you’re concerned, seeking guidance early can be empowering, supportive, and lead to the best outcomes.

 

The Takeaway 

You already have what your baby needs most: you. Every cuddle, every rock, every gentle movement counts. Early movement shapes the brain, and your loving attention shapes your child’s world.

• Babies’ balance systems start working by 7 weeks old (Morrone et al., 2015)
• Movement and gentle vestibular input (rocking, cuddling, tummy time) help wire the brain.
• Noticing “just noticeable differences” is a form of loving, proactive parenting.

 

References:

• Morrone, M.C. et al. (2015). “Motion Processing in Infancy.” Current Biology, 25(17), 2161–2166.
• Royal Children’s Hospital, Melbourne (2024). “Baby’s Head Space.”
• Alberta Health Services. “Developmental Milestones: 2 to 6 Months.”