Firstly, not worried, more curious. DS can say:
Look
Beeebeee (beep beep)
Dat (that, or cat, occasionally)
SSSS (meaning snake - hissss)
Raaa (meaning lion/tiger)
Gooo Gooo (in the tone of choo choo)
Ba (bye)
Where (but does not combine into a sentence)
Mama/Dada/Nana/Rama (grandma)
Bips (biscuit or drink)
Baps (fruit, usually apple)
Brr (ball)
Teesh (teeth)
Ta (thanks)
Do, do, DO! (one two three, not counting but leading up to something)
Dump (jump)
He can also sign:
Milk
Food/drink
Cat
Dog
Elephant
Monkey
Cuddle
Duck
He doesn't make any sentences at all yet. Just interested to see what the range is