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Hi, Dr. Mo here with JA. Please let me review the information and I'll reply shortly.
It could be RSV which is a virus, it could be bronchiolitis of other causes.
It would make sense that she would have more of a hard time breathing when laying down because the fluid and mucous in the lungs probably irritates her airway.
Is she still gaining weight in this time and consuming the same amount and having adequate wet diapers?
If she is doing fine otherwise I wouldn't be worried about something serious going on. It's most likely something viral that has caused inflammation in the lungs. It most certainly will resolve but might take time.
Please let me know if you need further help.
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