anxiety

Iv been googling (I know it's horrible to google) but I have VERY BAD anxiety when it comes to my daughter. When I say that I'm constantly worrying about the risk of sids basically or just small things. She will be 4 months on Friday and I was just wondering if anyone knows when the risk of sids decreases. Is sids rare? Am I worrying myself to much? I just love my daughter so much and just want a happy healthy baby! Help put my mind as ease? Thank you for any advice or info!!!