Heidi sounds like she is doing everything that a baby of her gestation should be doing, which is great! It is unfortunate but normal that she may require oxygen around this time, and that her saturations might start swinging as well. The nursing staff should be only noting the true ones and not all of them as, like you say, some of them will be just purely the monitor not picking up properly. Be assured she will grow out them as well as that oxygen need. Is she still on CPAP or is she breathing completely unassisted now? We used to jokingly tell parents that when they reached a kilo we required a kilo cake. Put yourself and your family first, everything else can wait. Good luck with everything.