My dd is 20 months old and I'm starting to have concerns about her speech as are her nursery. She is my third and I just can't remember how the other 2 were at this age! She's smiley and happy, communicates without talking really well but probably only has a vocabulary of about 5 words.
She has started babbling more but is generally really quiet.. everything she says she almost whispers!
My other two (8 and 6) are noisy chatter boxes so half of me wonders if she's just enjoying the chaos 
Any advice? How can I encourage her speech? We read books, play games but she just won't talk!