My child is 1 1/2 years old, and he does not speak anything. Do I need to worry?

I think you shouldn't worry too much. Different babies develop differently especially when it comes to talking. Does your child communicate in other ways to you like using actions or making random sounds? That's normal as well. Also, if your child is able to follow simple instructions, then it means that he or she shouldn't be too far along from talking. Sometimes I personally think it could be a personality thing as well. I didn't talk for years when I was a baby and even as a young child, I hated talking -- was always teased by the other family members for being "mute". Haha. Now they can't shut me up at all.