“W” sitting

My son will be one on Friday and he always “w” sits when he is playing on the floor. He’s not walking yet so he’s still crawling around everywhere . Whenever he sits that way I place him on his bottom but 5 seconds later he will sit that way again. I’m probably placing him on his bottom 50+ times a day.

Any advice? Is it horrible for him to w sit? I heard it’s bad for the hips