My one-and-a-half year old boy hasn’t started walking. I am worried about him. Anyone going through the same?

Some babies are faster, and some are slower. Your baby might be a bit slower to hit this milestone but may be faster at others. If you are overly concerned, do check with your PD. http://sg.theasianparent.com/baby-at-12-months-milestone-checklist-for-proper-baby-development/