Years ago I stumbled upon a movie that showed a very disturbed boy injure who I assumed was his brother. The child was approximately the age of a late elementary school student. He was extremely jealous of the baby and stabbed the latter with a pin. The younger boy was in his crib at the time. I never forgot that scene because it horrified me, but had always been curious about what I was watching.
sharePIN (1988) ?
shareCould be A Demon in My View, a TV movie from 1991. https://www.imdb.com/title/tt0102394/?ref_=fn_al_tt_4
In a flashback, the main character is a tween or teenager, asked to look after the neighbor's baby for an hour or so. He sticks the diaper pin into the baby's stomach not out of malice, just to see what will happen.
Thank you, AudreyR. Yes, that is it. However, it seems that the woman with the baby is the mother of the boy, who is named Arthur, and in that case, the younger child is the kid's sibling. Also, upon a closer look, I think that the baby is a girl, so maybe Arthur actually tortures his sister. I must say that I find your description odd. Unless if it's medically necessary, stabbing someone is an act of cruelty.
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