Looking for niece and nephew

At this point I can only find my niece as she is 18. Her name before adoption was Yasmin Salome Sauceda Rodriguez. She was born 5 weeks early in Colorado Springs to my sister Adrianna Rodriguez Moreno. She was born February 20th, 2020. She was adopted out in Kansas. I believe in Hays, Wichita, or Topeka. She was 3 years old and my nephew was about to be 2, they were adopted together. My nephews name before adoption was Joaquin Alessandro Rodriguez. I believe he had another last name but I cannot remember what it was. I believe his birthday was August 18th. I could be wrong on that. I just want them to know that if they are ever curious that their aunt never gave up on looking for them. I have waited 15 years to be able to begin this search.