Really interesting discussion. I highly recommend "Listen To Your Child" by David Crystal for those of you with barely-talking or unborn children. I go back to it every few months to look up what stage dd is at - there are always things to look out for and ideas for ways to record speech development. It's not at all dumbed-down though, it's clearly written by a scientist and based on research and controlled observation - a fascinating and substantial read. One thing, though, he barely covers bilingualism except to say that the perceived delay in speech acquistion is in fact less than the measured difference between boys and girls.
One thing to remember is that our sort of bilingualism, whether OPOL or home language/outside language is really rare. We're all highly educated parents who read parenting books/websites, automatically buy books for our kids, sing songs to and with them and generally see ourselves as their primary educators. I guess many primary school teachers think of "bilingual" children as those from economic migrant families who struggle with their family language and can barely communicate at all in the environmental language when they start school.
Contrary to what world has written, everything I've read on the subject suggests that 2nd children are generally the slowest to speak because the parental attention is diluted by the presence of the older sibling. 3rd and subsequent children do not show this delay, probably because they have more linguistic input from siblings.
The childcare issue is interesting - I was very surprised to read recently that the evidence pointed to childcare for under-3s being beneficial for verbal and cognitive skills, but detrimental for social skills. However the article went on to say that children of highly educated "erziehungs-kompetente" parents (that's us
) missed out on the more intensive stimulation their parents could give them by being in childcare - in other words, those who benefit least from childcare are the ones most likely to be using it!