Another benefit of being first

I knew that overall, it’s better to be born first. Firstborns get a 5 point IQ advantage, due to the teaching they have to do to siblings. But I never would have guessed that firstborns also get more quality parental time as older kids.

Factoid learned from Buy Ketchup in May and Fly at Noon. Firstborns spend about 3,000 more hours with their parents between the ages of four and thirteen than they younger siblings do during that time and may be a reason why many firstborns do better in life. More of the time parents spend with other children is spent watching TV.

I wish there was some explanation of why. Do parents have a stronger bond with their first child and therefore want to spend more time with them? Is it due to higher standards parents set for themselves and their kids for child number one? Is it the fact that firstborns are more comfortable in an adult world and with adult company? Or are parents just too pooped out to do much more than sit in front of the TV by the time their younger kids get out of toddlerhood?

Any thoughts?