Not bearing weight/ cerebral pasly

Hi my 5 almost 6 month old won’t bear weight for longer then a couple seconds. And one leg does better then the other. He lifts his head, passes toys in his hand, brings things to his mouth, rolls back to tummy (not the other way yet) he sits amazing supported and currently working on unsupported, he smiles and giggles, shows affection, tries to mimic but not very good at it, can obviously tell he studies faces too but every time I look it up it goes straight to cerebral palsy, even if I just look up ways to encourage him to bare weight. I can’t help but worry now. Has anyone’s baby done this and everything was fine ? Any suggestions on how to help him reach this milestone?