Watching your baby reach that first big milestone of sitting up is huge. It’s the moment they stop seeing the world from the floor and start engaging with it upright. But while it looks like a simple static pose, sitting is actually a complex physical skill that requires a mix of core strength, balance, and the ability to shift weight without toppling over.
As paediatric physios, we focus less on the exact date a baby sits and more on the quality of their movement. One of our favourite “secret weapons” for building these skills is the humble posting toy.
If you have a little one between 4 and 10 months old, here is how you can use simple “drop and post” games to help them find their balance.
What Exactly are Posting Toys?
“Posting” is just a fancy way of describing the action of putting an object into a container. You don’t need expensive equipment for this. Think:
- Dropping a tennis ball into a muffin tin.
- Putting large blocks into a plastic tub.
- Placing rings onto a stacker.
- Pushing scarves into a whisk or an empty tissue box.
From a developmental perspective, these tasks are gold because they force a baby to move their centre of gravity while staying upright.
Why Posting Builds Better Sitting
Sitting isn’t just about “holding still.” To sit independently, a baby needs:
- Core Stability: Engaging the tummy and back muscles.
- Weight Shifting: Learning to lean for a toy and return to the middle.
- Protective Reactions: Using their arms to catch themselves if they wobble.
When your baby reaches forward or rotates their torso to “post” a toy, they are essentially doing a gym workout for their postural muscles.
When to Start
You can introduce these play ideas as soon as your baby:
- Has steady head control.
- Is starting to “prop sit” (leaning forward on their hands for balance).
- Can grasp an object and let it go.
Most babies hit this stage between 4 and 6 months, but remember that every “bub” moves at their own pace.
Physio-Approved Play Ideas
1. The Supported Reach (Beginner)
Sit your baby on the floor between your legs so your body provides a “safety net” for their hips and back. Place a wide container directly in front of them.
- The Goal: Encourage them to reach forward, grab a toy, and drop it in.
- Why it works: This builds forward reaching and gets them used to activating their core without the fear of falling backward.
2. The Side-Reach Challenge (The Game-Changer)
Once they are steady reaching forward, move the toys to their left or right side.
- The Goal: Force them to rotate their chest and shift their weight onto one hip to get the toy, then move back to the centre to post it.
- Why it works: This is the most critical skill for independent sitting. It teaches the body how to balance dynamically rather than staying “stiff.”
3. Elevated Posting
Place the container on a slight literal pedestal—like a low firm cushion or a sturdy box.
- The Goal: Your baby has to sit up taller and “extend” their spine to reach the target.
- Why it works: It prevents slouching and strengthens the muscles along the spine (the back extensors).
4. Mix Up the Textures and Sizes
Use a variety of objects like silk scarves, heavy blocks, or round balls.
- Why it works: A heavier object changes their centre of gravity more than a light one, forcing their muscles to react and adapt to different loads.
A Few Things to Keep in Mind
- Don’t over-prop: If you surround a baby with so many pillows that they can’t move, their muscles won’t learn to do the work. Use “just enough” support so they can wobble safely.
- Keep it within the “Strike Zone”: If the toy is too far away, they’ll just collapse. Keep the toys within arm’s reach initially to build their confidence.
- Quality over Timelines: Don’t worry if the neighbor’s baby is sitting and yours isn’t yet. Focus on how well your baby is moving and reaching.
When to Chat with a Professional
While every baby is different, it’s worth a quick check-in with a paediatric physio if you notice:
- Your baby feels very “floppy” or very “stiff” when you sit them up.
- They always lean or fall to one specific side.
- They aren’t able to hold their head steady by 6 months.
Bottom Line
Helping your baby learn to sit doesn’t require a lounge room full of plastic gadgets. With a few containers and some intentional “posting” play, you’re giving them the physical foundations they need for a lifetime of movement.