It sounds like he's got some frustration with communicating. It's a tough age because they know a lot more than they can express. I used baby sign language with mine. Well, mostly with my first as my second was a big talker and often learned words before signs. My first didn't really get verbal until after 18 months though. Older generations had concerns that she'd never talk, but we felt she would and she did. Once she started, she spoke in full sentences and hasn't ever had any language problems. It was extremely helpful to be able to "talk" with her before she was ready verbally. It helped us to avoid many tantrums and frustration on both ends - parent and child. There are lots of books, videos and even classes for doing signs with little ones. Basically you want to start with one basic sign that you will use frequently - like drink or eat. Then you want to use it every time you say it. At 14 months, it won't take him long to learn to associate the sign with the word and begin trying himself. The first sign takes the longest for them to make the connection. My daughter eventually had over a hundred that she used. She even made up her own which was really cool. Instead of getting frustrated, she'd act out what she was trying to tell us since she knew we used different movements of our hands and bodies to say other words/ideas. We started around 8-9 months probably, but you can teach it at any age.