I am not a mother yet but I can believe of these fears. Loosing a child is the worst thing that can happen to anyone but I know God grants peace to survive in case it happens. My brother died last year at 33 so my mom went through it. Deviastating but she has survived. She will never get over his death that's true it but she still has a passion for life and overall by now I think she is okay. There was old lady who is dying now of old age who told me once "when we die we begin to live". From that moment I began to not fear death anymore.
God bless your child!