Joanne Sharkey, 55, admitted responsibility over the death of the baby boy, who was named Callum by police investigating his death in 1998.
His body was found close to Gulliver’s World theme park in Warrington, Cheshire, on March 14 that year.
Sharkey, aged 28 at the time, was traced more than two decades later, through DNA checks after the arrest of her other son.
At a sentencing hearing at Liverpool Crown Court, Sharkey was given a two-year prison sentence, suspended for two years, and told she must undergo mental health treatment.
• Subscribe to ITV News on YouTube: http://bit.ly/2lOHmNj
• Get breaking news and more stories at http://www.itv.com/news
Follows ITV News on TikTok https://www.tiktok.com/@itvnews?lang=en
Follow ITV News on Instagram: https://www.instagram.com/itvnews/
Follow ITV News on Facebook: https://www.facebook.com/itvnews/
Follow ITV News on Twitter: https://twitter.com/itvnews
