Leanna Harris described the toddler as perfect and told how he changed her and her husband's lives.
"As children do, he turned our lives upside-down," she said. "Cleaning, changing diapers, dinner, bath time. Finally, what I would call mommy time. I wouldn't trade it for the world."
Leanna Harris said Cooper had had trouble sleeping of late, and he had slept with her and her husband the two nights before he died, "snuggling in between both of us."
"I remember turning over in the middle of the night. His mouth was open and his full toddler lips just breathing right into my face. I will cherish that moment forever."
She said she was "happy" that Cooper would miss some of life's letdowns, including his first heartbreak, his parents' and grandparents' deaths and who to sit with at lunch at middle school.
"I miss him with all of my heart. Would I bring him back? No. To bring him back into this broken world would be selfish," she said.
The mother closed by saying that she wasn't angry with her husband and that Cooper "meant the world" to Ross, whom she described as a "wonderful daddy."