11m milestones not being hit

Hey all! I have 4 boys, the youngest just turned 11m on january 4, 2025. He still isnt crawling or getting on all fours. Hes also not pulling himself up. He'll stand, supported, if you stand him. The closest he gets to "crawling" is from the sitting position he gets to the point where hes pulling forward but not over 1 leg (if that makes sense) he rocks from there. He also does move but not in a voluntary scoot, more like a consequences of pulling forward and sitting back. I know all babies are different and the pediatrician said they dont use crawling or walking as milestone gauge, but it still has me concerned a little bit. When i manipulate his body to go on all fours. His will but after a few seconds he'll usually bring his pelvis to the floor and his legs are flat to the sides (like a frog). Idk, im not sure what im looking for from this post. But if you have anything to say please say it! Thank you...ps hes pointing, clapping, talking so much.