Hi, I have asthma and so does my DS.
When he was 11 months old he had his 1st 'attack'. He spent 3 days in hospital having hourly nebulisers.
His second time was this time last year, only 1 night in hospital this time. As they get bigger, they respond to the drugs better.
If they're noticeably wheezing, straight onto the doctor. If it's nightime, they should be straight around to you as a priority case.
I'm guessing you have a spacer for your DS? These are great and ensure that even if they're very tight that at least some of the salbutamol is going to get to where it needs to be. The trouble with asthma is, although the drugs are brilliant and work almost instantly, you need to be able to breath them into your lungs suffieciently for them to work. Therefore, if you're already at the point where you're struggling to breath, chances are you're not going to get enough of the drug into your system to make a difference.
Always call or take your DS to the doctor, they should see him straight away for suspected asthma attacks. They should also have a nebuliser at the surgery. With small children, you can never tell how it's going to go. It can very quickly get worse or get better. I know from experience that they really don't mind on the occasions that they're showing signs of having an attack but respond quickly to the medication and no intervention by the doctor is required after all. Better to be safe with asthma.
The blue inhalers (salbutamol) have an unfortunate side effect where if you take too much, they increase your heart rate and give you the jitters. So if you've given several blasts and they're still struggling - coughing, wheezing, not talking then get them to the doctor straight away.
I really hope this is helpful for you.