I'm happy that you have asked me to assist you with your child and hope that you can benefit from my many years of helping parents like you.
Hi. I'm sorry your baby is having problems. With a normal birth weight and I assume no problems with your pregnancy, labor or delivery, normal Apgar scores, etc she is likely just having some temporary issues with her lungs.
We see full term babies do this sometimes, including my youngest daughter who quit breathing on the second day due to some retained fluid in her lungs.
The Apgar score is a measure of a baby's alertness, heart, breathing, reflexes, etc and is done on all babies at birth, one minute and five minutes of age. If she had problems at birth you would have known it and they would have had to give her oxygen and perhaps stimulate her to get her to breathe when she was born.
The tests are routine in any baby with her history to rule out infection, bleeding in the brain, etc but as with my daughter, these are the usual precautions taken with all babies who have any problems like hers and antibiotics are given and her heart will be monitored as well as her oxygen.
There are several problems that can be ruled out with the tests they've done and have ordered and I can tell you that most of the time this clears up in a day or so.
Is she on oxygen now?
Good, that means her lungs are probably fine and she probably just needs a day or more to mature a bit. Some babies just take a few days to wake up good and remember to breathe.
We see this all the time and as with my daughter, she will likely stop doing this in the next day or so and be ready to go home. The tests will rule out other problems like infection, issue with her brain, etc. Just hang in there and give her a little time. This is why we hate to see babies going home from the hospital at 24 hours or worse, delivering at home where problems like hers might get missed and tragic outcomes can occur.
That is routine when cultures are done as we want to be ahead of the problem if an infection is going on but not detected for a couple of days with the culture.
Give her a day or two and all of this should be cleared up but in the meantime she's being observed closely by the NICU.
We see this every day and most of the time, again with a normal pregnancy and delivery, everything will be fine.