Thanks MegMeg for the reality check.
Most pediatrician screening looks for problem, so the numbers they look for tend to be at the threshold between low-normal and delayed. Not the norm. There is also a ~6month (I think) difference between boys (the median boy) and girls (the median girl) and a huge spread between the low and high ends of normal.
DAD22, have you found any good research on language development for multilingual children? The data I have seen (we speak a language other than English at home, and DS5 and DS8 are enrolled in a Spanish immersion elementary school) often seems poorly researched, on both the "multilingualism is wonderful, it will make your child brighter" side and the "being exposed to more than one language too early will break your child's brain" side (caricaturing only slightly ;)).
