Is it true that drinking milk that has high level of DHA can really contribute on a child's multiple intelligence development?

DHA has lots of benefits for our bodies, including the development of brain function. So to answer your question, yes, it can help a person's brain development overall. Sharing you a good read about multiple intelligence: http://kidsrsimple.com/2014/06/27/multiple-intelligences-how-do-you-view-your-child/