I have started to use the Montessori tools when my BB was around 7months old. I show him the colour plates first. I also demonstrate the 插座圓柱體 to him. Of course, I let him try the simplest set first when he was 12 months old. I also try to demonstrate the other tools such as 紡箠棒箱 and etc. I think all these are good concepts and stimulation to him. But I think the actual impacts and results can only be shown at a latest stage i.e. over 18 months. In addition, the Montessori tools should be used from around 1 year old and even up to 7 year old. So I think it is worth to invest for buying a family set. I know that the following website www.myboss.com.hk can provide Family set and the quality is good. Feel free to share again.