Using a spacer with your child’s inhaler dramatically improves how much medication reaches their lungs. Without one, only about 34% of the medicine gets where it needs to go. With a spacer and proper technique, that number jumps to around 83%. The spacer acts as a holding chamber, trapping the burst of medicine in a tube so your child can breathe it in at their own pace instead of needing perfectly timed coordination between pressing the canister and inhaling.
Choosing a Mask or Mouthpiece
The biggest decision is whether your child needs a face mask attached to the spacer or can use the mouthpiece directly. This depends less on age and more on your child’s ability to follow instructions, control their breathing, and form a tight seal with their lips around the mouthpiece. That said, general guidelines offer a starting framework: children under 3 or 4 typically need a face mask, while children around 4 to 6 can usually transition to a mouthpiece alone.
The real test is practical. If your child can close their lips firmly around the mouthpiece without gaps, breathe in when you tell them to, and hold that breath, they’re ready for the mouthpiece. If they can’t do those things consistently, stick with the mask. There’s no downside to using a mask a bit longer if your child isn’t quite ready.
Step-by-Step: Spacer With a Mouthpiece
These steps apply to children (usually around age 4 and up) who can seal their lips around the mouthpiece and follow breathing instructions.
- Check and prep the inhaler. Remove the cap from the inhaler. If the inhaler is brand new or hasn’t been used in several weeks, you’ll need to prime it first by spraying a few puffs into the air. Each inhaler brand has its own priming instructions, so check the package insert.
- Shake and attach. Shake the inhaler well for about 5 seconds, then insert it into the back end of the spacer.
- Position your child. Have them sit up straight or stand. Ask them to breathe out fully to empty their lungs, and do this away from the spacer so the exhaled air doesn’t push back into the chamber.
- Seal and spray. Place the mouthpiece in your child’s mouth and have them close their lips tightly around it. Press the canister down once to release one puff of medicine into the spacer.
- Breathe in slowly. Your child should breathe in slowly and deeply for 3 to 5 seconds, taking the biggest breath they can. If your spacer has a whistle, a slow, quiet breath is the goal. A whistling sound means they’re breathing in too fast.
- Hold the breath. Have your child hold their breath and count to 10 (or as close to 10 as they can manage), then breathe out normally.
- Wait between puffs. If a second puff is prescribed, wait about 1 minute. Then shake the inhaler again and repeat the full sequence.
Step-by-Step: Spacer With a Mask
For younger children or toddlers who can’t use a mouthpiece, the spacer attaches to a soft face mask instead.
- Prep the inhaler. Remove the cap, shake well, and prime if needed. Attach the inhaler to the spacer, then attach the mask to the other end.
- Create a seal. Place the mask gently but firmly over your child’s nose and mouth. The seal matters a lot here. Any gap between the mask and your child’s face lets medicine escape into the air instead of into their lungs.
- Spray one puff. Press the canister down once to release one puff into the spacer.
- Count six breaths. Keep the mask in place and let your child breathe normally. Watch their chest rise and fall, and count six full breaths. There’s no need for a deep breath or breath-holding with this method since the mask allows the child to inhale the medicine over several normal breaths.
- Wait before repeating. If a second puff is needed, wait 30 to 60 seconds, shake the inhaler again, and repeat.
The Most Common Mistakes
A study of children hospitalized with asthma found that technique errors are extremely common, even among families who use inhalers regularly. Nearly 1 in 5 families didn’t use a spacer at all when demonstrating their technique, which immediately cuts the amount of medicine reaching the lungs by more than half.
For children using a mouthpiece, the most frequently missed step was breathing out fully before inhaling the medicine. Over 90% of children in the study skipped this step. Emptying the lungs first creates more room to draw in a deep breath of medicated air. The second most common error was breathing in too quickly, which was missed by nearly 70% of children. Fast inhalation pulls larger medicine particles into the throat instead of carrying fine particles deep into the airways.
For children using a mask, the biggest problem was not waiting long enough between puffs. About 72% of caregivers moved to the second puff too quickly. Rushing between puffs means the airways haven’t fully received the first dose before the second one arrives.
What to Do if Your Child Is Crying
This is one of the most frustrating parts of giving a young child inhaler treatments, and it genuinely affects how well the medicine works. Research shows that lung deposition in crying babies drops to about 0.35%, compared to 2% during calm breathing. That’s roughly a sixfold reduction. Crying creates a pattern of long exhales followed by short, fast inhales, which means very little medicine gets drawn into the lungs. On top of that, crying children swallow about 50% more of the aerosolized medicine into their stomachs rather than their airways.
Up to 49% of young children don’t tolerate face masks well, so you’re not alone in this struggle. A few approaches can help. Try giving the treatment while your child is calm and distracted with a toy, a show, or a game. Some families find success by letting the child hold a spare spacer or play with the mask beforehand so it feels less unfamiliar. Pacifier-style masks exist that let infants suck on a pacifier while the medicine is delivered, which can reduce fussing and maintain a good seal. Administering the treatment during sleep is another option, since breathing is more regular and consistent when children are asleep.
One technique to avoid: blowing the medicine toward your child’s face without the mask sealed against their skin. This “blow-by” approach delivers almost no medicine to the lungs, even though it might seem like a reasonable workaround for an uncooperative toddler.
Cleaning and Maintaining the Spacer
Spacers need weekly cleaning if you’re using them daily. Over time, medication residue builds up on the inner walls and valve, and the chamber can collect dust mites and mold, both of which can trigger the very symptoms you’re treating. Static electricity is another issue. Plastic spacers build up a static charge that attracts medicine particles to the walls of the chamber, reducing the amount that actually reaches your child’s lungs.
Follow the manufacturer’s cleaning instructions for your specific device. Most recommend washing with warm water and a small amount of dish soap, then letting the spacer air dry rather than toweling it off (wiping can increase static). Some spacers are made with antistatic materials, which reduces this problem. Before each use, give the spacer a quick visual check for cracks, debris, or damage. A cracked spacer won’t hold the medicine properly, and a damaged valve can change how the medicine flows.
Putting It All Together
The technique details matter more than they might seem. A child who uses perfect spacer technique can get nearly twice the lung deposition compared to one with poor technique. The key points to lock in: shake every time, one puff at a time (never spray multiple puffs into the spacer at once), breathe out before breathing in when using a mouthpiece, slow steady breaths, and a tight seal whether you’re using a mask or mouthpiece. If your child’s spacer has a whistle built in, use it as your guide. Silence means they’re breathing at the right speed.