Slow physical development

Hi, i have a concern on my son physical development. He is 10months & 18days today but he still unable to stand straight / bear weight on his legs. He can sit, but he need to support with both of his hands to balance himself from fell forwards / sideways. Other development like cognitive, speech, socio emotional is fine for him. Should i worry more on this setback or just be chill and follow with his own pace?