it is 20 years since the worst case of homegrown terrorism in us history .
timothy mcveigh killed 168 people with bomb in oklahoma city in 1995 .
terror was encapsulated by photo of a firefighter carrying a lifeless baby .
that baby was baylee almon , who had turned one the day before .
nearing what would have been her 21st birthday , her mother aren almon-kok tells dailymail.com how she marks baylee 's birthday every year .
but says she will never get over the pain of seeing that photograph .
she is still in touch with the firefighter who was pictured with the baby .