Nearly 2 yr old DS only has a handful of words. Will speech come 'overnight' as people keep telling me? He speaks whole sentences of gibberish although from his intonation I can tell when he means 'over there' etc. He has also developed signs for driving, sleeping etc- I did not encourage this! He says 'bye' 'yeah' 'Po Pa' ( Postman Pat) 'nana' 'Dada' and lots of animal noises. He tries to say Jess, Ted Glen, Alf Thompson but not mummy!! He's not frustrated and he understands everything. His hearing is absolutely fine and he's very happy. Should I just chill out?