Why does my baby have difficulty breathing?

Dear Doctor, I recently gave birth to a baby girl. She will be two weeks old on Sunday. However, I’ve noticed her breathing is very heavy, mostly in her sleep. When she’s awake, she seems okay. I don’t know if she’s getting the flu or if she has asthma. I have never given her anything else like formula as she breastfeeds well. She doesn’t have a temperature either so I don’t know why she sounds like she has difficulty breathing. Sometimes, when I place her next to me, it stops. What could this be? Is it normal for her age?
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Dr. Rachna Pande