A reversal of teen suicide rates... and a possible link between a man's height and cancer risk.Meg Oliver has those stories and more in today's health watch report.A troubling study raises new concerns about kids committing suicide in this country.After a dramatic 15-year decline suicides among US children appear to be on the rise. The analysis found that while youth suicide rates fell about 5 percent in 2005 after a large increase in 2004, they still were far higher than expected based on historical trends.A new study suggests taller men are at greater risk for prostate cancer and more likely to have cancer that progresses quickly. The researchers doubt that height itself is the reason for the increased risk, but it may serve as a marker for something biological associated with developing cancer.Researchers report children born extremely premature - considered before 25 weeks - are at significantly higher risk for behavior problems by age 6, with boys particularly vulnerable. Experts aren't sure why but think it may be because the brain hasn't had enough time to develop. They say greater contact between parents and babies in the first few days after delivery may help.Those are some of today's top medical stories.I'm Meg Oliver - CBS News - New York.