Transient Tachypnea of the Newborn

OK, so I had a newborn the other day that had some problems after birth. Came on at 30minutes of age. Started grunting, nasal flaring, faint crackles in lungs. Sats at 88%. Started baby on O2, kept them to be monitored. Baby was not tachypneic! RR was always within normal. Desat'd w/ crying or activity (diaper changes, etc) but would return to 95% within 25-30 second on the O2. Required this for 2 days then magically came out of it all and had no problems! MD kept calling it TTN, but baby was never tachypneic. Does that really matter or is it the comination of symptoms and not all have to match? I'm confused here.