premise: Smilling and laughing baby in a walker with fire engine airplane mobile and other toys on the floor. hypothesis: The baby's diaper is full of feces.
contradiction: The baby is smilling and laughing baby which indicate that it is comfortable which would not be the case its its diaper is full of feces.|contradiction: If a baby's diaper is full of feces, the baby is unlikely to be smiling and laughing.|contradiction: A baby is not usually smiling and laughing when the baby's diaper is full of feces.