I saw that IQ thing and I suspect it's statistically insignificant. I'd say rather than in-born differences it's the pressure to "be an example" that causes this. Every first-born I've talked to about this in the past had the same experience of their parents demanding a little more of them than of their younger siblings.
(no subject)
Date: 2007-06-25 09:20 pm (UTC)(no subject)
Date: 2007-06-26 08:35 am (UTC)(no subject)
Date: 2007-06-27 03:14 pm (UTC)