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woman murders son(toddler) for revenge against her husband, possibly cheating

Not sure if its a movie or an episode, What i remember,,,,,woman marries man, she doesnt like sex too much, but they end up having a little boy, woman is cold towards the man, and she becomes depressed or something, i think the man was having an affair now as he wasnt getting any sex or love at home, and woman may have found out, so on boys birthday (hes toddler i think) they throw a birthday party for him, and hes wearing a little sailor outfit, before guests arrive, the woman takes her son to the park to either feed the ducks or play with his sailboat, she drowns son, and tries to commit suicide, man realises where they are, and runs to the park, to find his son dead, and his wife barely alive, afterwards she becomes institutionalized or something along those lines, and he pretends she died with his son, and gets new girlfriend/wife, and doesnt tell new gf/wife that shes alive, when he tells new gf/wife bout his wife murderin their son, he says how 'she wanted to hurt him' and so thats why she killed their son, 'he was the only thing he loved the most', something along those lines, i cant remember actors or anything more about the plot, just that, any luck?
asked Jan 11, 2013 in Name That Movie by Emmers0n (1 point)
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