Please help!! 😭

My two week old baby sounds a little congested, and all of a sudden is falling asleep while eating (we are formula feeding and she usually stays awake for 30-45 minutes after eating and is usually extremely alert during a feed). I’m feeling very anxious and wondering if she might have a cold. We also had our newborn pictures yesterday and she didn’t sleep very good pretty much the whole day, so I know it’s possible that she’s just exhausted from yesterday. Does this sound like she could be developing a cold, or is it more likely that she’s just randomly very tired? What should we do if it is a cold? How will we know if it is a cold? I’m very worried about rsv and I’m a ftm 😭😭

Edit: I called the pedi and they said as long as she’s pooping and peeing and still eating then she’s fine but I’m still worried 😭