RajX- It is probably highly competitive business but selling kids product is not a bad business. However, as years go by, Kathmandu will be filled with a lot many old people (already is). There may not be a lot of competition in 'senior care services'.

Another biz that may work well - medical clinic (franchise would be great). People become more sick in Nepal than in US and it is 'pay the cash first and get your medicine' business. Even ambulance service may be a good business. Again, you need to have background plus interest. One business that I have seen to have worked very well for the people that I have known - selling kath or wood for home building.  But, as someone told me once- the best biz in Nepal is - Thagi