Warped Puberty

Is bisphenol A to blame for the early onset of puberty in young women?

See: The Pre-teen Girl Mystery

Cheer For Your Kids. Cheer For The Other Kids.

The letter is about swimming parents, but can apply to all parents who have kids active in sports.

See SciBlogs: An Open Letter For the Parents of Swimmers

Redshirting First Grade

Yesterday morning NPR had a story about teenage football kickers. The boy they interviewed was 15. But he was in the 8th grade!

I was 17 when I graduated from high school. I was always one of the youngest kids in my class. I never found it to be an academic deterrent. It was an athletic challenge - a challenge until I was 16 and in my junior year that is. At that time my body caught up to the lessons and skills I had developed from always competing against more physically mature opponents. In the end I saw it as an advantage.

But it seems there is a trend of more parents delaying their child's entry into school in order to provide an advantage that an extra year of development provides.

See Federal Reserve Bank Of Boston Working Paper: The Lengthening of Childhood

there is little evidence that being older than your classmates has any long-term, positive effect on adult outcomes such as IQ, earnings, or educational attainment. By contrast, there is substantial evidence that entering school later reduces educational attainment (by increasing high school dropout rates) and depresses lifetime earnings (by delaying entry into the labor market)

I also read a recent book review of 'The Nurture Assumption' (See sp!ked: It’s time to move beyond the nature/nurture divide). This book makes the argument that parents have very little to do with how their child turns out. And in fact, genes and peer groups are the most important determiners.

‘The experts are wrong: parental nurturing is not what determines how a child turns out'

This relates to this idea of redshirting because many parents believe that they can improves their child's self-esteem if they give them an advantage to succeed. However, as the book argues:

Contrary to the current orthodoxy, Harris argues that self-esteem is based on what we do, not on how we are encouraged to feel.

Looking at this from my own standpoint as someone who was young but had a best friend in elementary school who was redshirted (held back in first grade actually), there is no doubt that he had higher self-esteem for a long time and I wondered what was wrong with me. However, over the long term the advantage I gained of besting older kids prepared me better for the real world than the short-term artificial advantage provided to the kids who were held back.

But in the end, the parent is right. If a parent feels that their child is not ready for school then they must trust that instinct. However, they must also keep in mind if their decision is based on what they want or what their child needs.

Maybe Morning Sickness Is A Good Thing?

From NewSci: Morning sickness may be sign of a bright baby

Morning sickness, which affects most pregnant women, is thought to be a reaction to the hormones human chorionic gonadotropin and thyroxine, which are secreted at unusually high levels during pregnancy to maintain a healthy placenta. Now Nulman speculates that these hormones, which are higher in women who experience morning sickness, may protect the fetus's developing brain.

The Home Alone Question

When I was 10 my parents and grandparents thought I was old enough to stay home alone. But then after almost cutting off my thumb on a power saw (I believe I stopped the bleeding by promising God I'd stop being mean to my sister) it was awhile before I was home alone again.

In general though, it is a question of maturity and therefore boys and men should probably never be left alone but girls are probably fine around 8.

See NPR: Home Alone: Is Your Tween Ready?

You Can Relax About The Pacifier

See NYT: Children: No Harm to Breast-Feeding From Pacifiers

Writing in The Archives of Pediatric & Adolescent Medicine, researchers say they found no good evidence of a link between pacifier use and nursing.

“Pacifiers have traditionally been thought to interfere with optimal breast-feeding,” wrote the researchers, at the University of Virginia School of Medicine. In the 1980s, health officials discouraged their use.

But in recent years, researchers have found evidence that babies who use pacifiers when they sleep may be less susceptible to sudden infant death syndrome. The American Academy of Pediatrics now recommends that pacifiers be used for that reason.

Speech + Movement Can Improve Kids' Learning

See: Gestures and learning: Using gestures -- not just seeing them -- can help kids learn