The standard assumption is that teen mothers are less likely to have healthy children than older mothers. But my late father-in-law, who knew a lot of teen mothers as a public high school teacher in Chicago, questioned that conventional wisdom. Sure, if a malnourished 16-year-old peasant girl who weighed 90 pounds and had just gone through puberty at 15 got pregnant, that didn`t bode well for the baby. But in his experience, the girls who got pregnant at 16 tended to be robust 150-pounders who had gone through puberty at about 11. He hypothesized that, say, NBA power forwards would tend to have younger mothers than the average man.