I think that this idea could contibute in children development. the thing is to bring them the tools to create a community and the necesary raw material to be able in the construction of a sustainable enviroment.
Another thing it could include are, soap, desifencant or this type of things that could help in the hygiene of the children. Cleaning their hands is so important, and this simple added soap could avoid some illness.
Some countries are so sexit, so it might be interesting creating responsabilities for the girls that boy must accept. For example: the women has the key to get water from the well. But in this case, small responsabilites to the 5 years old girls.