7 month old not babbling...

Kayley • 24 years old, I have a little boy who’s 4 and I’m TTC my second baby!! 👶🏻
My son is nearly 7 months and he doesn't babble, he makes the odd noises but he mainly screams and whinges or makes hissing noises. My friends baby is 2 months younger and babbles all the time saying ba ba ba, da da da. But my son doesn't make any noises like this. Should I be worried?