I'm with Laura S. And I will add, get an opinion from someone with expertise in cardiorespiratory issues. Slap on a pulse oximeter while they are at it, both at rest and during a feed and after, and if someone can do an echocardiogram, so much the better. This baby's energy may be getting used up by something undiscovered and it could be serious. It may sound vague and not urgent but if a mother of two other children expresses a concern about something so global, I would listen closely and investigate thoroughly. She may have noticed signs of a cardiac defect long before the baby begins to decompensate and it is to everyone's advantage to find out sooner rather than later whether that is the case.

Rachel Myr 
proud grandmother of a successfully treated child with a serious circulatory defect, picked up while she was still in great shape because we paid attention to the subtle stuff in the early weeks - I pay much more attention to my gut feeling nowadays :-)
Kristiansand, Norway

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