On the subject of infants and respiratory failure....been through that myself.
As a matter of fact, we almost lost my son as an infant due to this. He had been crying a lot and very fussy, but wasn't spitting up or anyting. The pediatrician we saw (at the time) told us he had Acid Reflux and that we needed to have X rays to determine if he had a "soft tissue obstruction". So we had X rays--nothing of the sort. So then she says, yup, definitely reflux.
Little guy continued to cry all day, no sleeping, wouldn't eat, then got very lethargic. I was packing to leave for a training course when I noticed him turning blue and struggling. I grabbed him up and couldn't tell if he was breathing or not, so I started doing infant CPR and told my wife to call 911. I got him slowly "coming around" about the time the first Fire/Rescue truck arrived. Fire department EMT's recognized my address and didn't even slow down at the front door, nor fool with a stretcher.
They grabbed him, put him on Oxygen and whisked him out the door and took off for the helo take off point....Air asset was already enroute.
G man was airlifted to Wolfson's Children Hospital in Jacksonville where he spent the next three weeks in neonatal.
Lots of sleepless nights---and I was supposed to start a new job the next day---that didn't happen.
We eventually found out he had a sever respiratory infection, but we have had no real problems since, though we put him on Xopenex (sp?) at the first sign of trouble for a couple of years.
Now, he's just a normal rambunctious three (almost four) year old and shows no signs of asthma or anything...
We got a new pediatrician post haste....