⚡️🧠 NEWS - According to one study, first born children have higher IQ than their siblings.
Discussion
“That’s bullshit.” - Second Born Child
I thought this often had to do with the health of the mother. Kids draw nutrients from the mom and they may not be replenished between births. In my younger years I had heard that the firstborn often had better immune systems, which I'm not sure if it's true or not, but makes sense.