Two-year-old Joshua Barnett fell into a garden pond while his mother was busy using Facebook inside the home near Beverley, East Yorkshire.
31-year-old Claire Barnett realized too late what had happened and was unable to save him.
The mother of three other children is alleged to have had social services called on her at least once before when sheâ€™d let Joshua and another boy play outside unsupervised and they were nearly hit by a car.
She was found guilty of four counts of child cruelty in Hull crown court and sentenced to five years in prison.
Judge Jeremy Richardson said during her sentencing, â€œYour son died due to your neglectful conduct. You will have to live with that for the remainder of your life. For a parent to behave as you did, repeatedly, amounts to consistently bad parenting. I trust you will never be allowed to have further unsupervised contact to any child. If you should have any further children, they will almost certainly be removed from you.â€