Good evening girls. My daughter is 5 months old and they said there's …

Good evening girls. My daughter is 5 months old and they said there's a noise in her heart. Nothing like that was mentioned at discharge from the hospital, during pregnancy, an ultrasound also showed nothing so everything was normal. Now two pediatricians have said there's a noise in her heart, gosh I'm worried and stressed out. One doctor said that the valve should close by one year old. I think I should take my daughter for another heart ultrasound. But gosh, it's not good ??offfffff. Can you tell me if anyone had this? I hope nothing serious, like a heart defect there ? I hope it will go away. There's no pallor. She doesn't