Alamak, I understand your worry, it's quite common at 2 years for some children to still be at one-word stage, especially if they understand everything you say, so that's actually a good sign lah. I think since you're noticing he understands instructions well, it would be really reassuring to check with your paediatrician just to make sure everything is on track, because every child develops at their own pace and a doctor can give you proper guidance. In the meantime, keep doing what you're doing, talking to him throughout the day, naming things, singing songs, and reading books together all help lots. Don't stress yourself too much, mama; the fact that you're already putting in effort every day shows how much you care.