Birth Order and Intelligence: Why do siblings raised in the same home have different brains?

Intelligence Differences Among Siblings: It's often believed that the firstborn child is the most intelligent. There's some scientific basis for this belief. Let's explore what the study says.

Does birth order affect children's intelligence?

Which Sibling Has the Highest IQ According to Science: Siblings raised in the same household often have very different intelligence, thinking patterns, and behavior. The question of why this difference exists despite similar upbringing, similar resources, and similar environments has long fascinated psychologists and researchers. Now, research is beginning to explain this mystery to some extent, with birth order also appearing to play a significant role.

Which child is more intelligent?