German to English Medical Medical (general) Pediatric physical examination

This is from a German medical report, examination of a 4 1/2 month year old boy.

In the "Aufnahmebefund" section:

"... leicht blasses Hautkolorit, AF im Niveau, Pulmo seitengleich belüftet"

I think "AF" probably means "Atemfrequenz", or breath rate, but just would like confirmation or rebuttal from native German speaker or someone else in the field. In my experience, "im Niveau" with an infant usually refers to the Fontanelle, but never saw "AF" as abbreviation for that.

Thanks!

Stephen