Ahhhhh.... I am so delighted by this thread.
CF is CF. No two cases are the same. Many use the adjective "atypical" to make themselves feel better. Or they're misunderstood. If you can't tell, I think the label is ridiculous.
I'm 26, My FEV1 is 98%. I've had IV's only 7 times in my life. Am I atypical? Nope. I have CF. I don't have a need to feel special or different than those other CFer's... I have CF but my CF is not that same as anyone else's just as no other two people's CF is the same.
Ask some of the older CFer's in their late 30s and 40s on this site who were diagnosed with CF in their childhood..... they didn't need nebs or do chest PT etc etc until later in life. but now they do IV's often, some have had Tx and some might need them soon. so childhood presentation is in no way a predictor of what will occur at an older age.
But as medicine for CF improves, preventative therapies applied, CFers who would have presented earlier in life now present later. in other words, just cuz your kid doesn't have PA or doesn't need IV's by their 2nd birthday doesn't mean this is an atypical case of CF. probably means great preventative medicine is being applied and if your kid was born 10 years earlier, symptoms would have presented earlier.
denial is a strong phenomena - and in some cases can be harmless. what i worry about is denial interfering with 3 month clinic visits and rigorous preventative therapies due to the parents wanting to believe the children don't need them because they're that magic word some ignorant person uttered - <b><u> Atypical </b></u>