Dreams of suffocating

Since the birth of my baby which was 5 months ago, I've been having dreams that I can't breath like my head and mouth swelling to where I can't get any air out or in also other situations where I just can't breathe. From what I know I don't snore or have any breathing problems while sleeping but I'm not 100 percent on that. Has anyone else gone through this? It's sort of disturbing, I also had a dream about my niece and me not being able to breath and I tried and tried to get to her to help her but I couldn't, it was terrible!!! What could this mean?