Any good tcm to recommend for building children's immunity?

The Eu Yang Sang website suggests adding herbs to a child's diet which can strengthen the spleen and lung systems and improves overall Qi. Thy include - Poria (Fuling, 茯苓) - White Atractylodes (Baizhu, 白术), --- Euryale Seed (Qianshi, 芡实), - Coix Barley (Yiyiren, 薏苡仁), - Astragalus Root (Huangqi, 黄芪) - Chinese Yam (Huaishan, 淮山). http://www.euyansang.com.sg/boost-your-childs-immunity-with-tcm/eysimmunity2.html