ds1 had about 80 words by 20 months (sad, I know, but I wrote them down at the time); ds2 was about 60 words by the same age, dd is now 19 months and only says 'daddy', 'no' and 'get down'. She understands everything though, and will fetch her shoes if you ask her to/put things in the bin when asked/gie kisses when asked and give things to her brothers when asked. She sings away in her baby babble all the time, and does the actions to nursery rhymes, which I don't remeber the boys doing. I'm not that worried about it, just curious as to whether anyone else has had a similar experience with their third.