Yum... watermelon

We have been teaching Noah sign language, which has been great because he communicates well. However, we are anxiously waiting for him to talk! Many people have told us since he is exposed to several languages (Korean, English, and Sign) that he will take his time to communicate verbally. Lately, he has been exploring with sounds and at Bubbe's house he was very motivated to say, "yum...watermelon" (the watermelon was laced with a pinch of sugar). Will we have to sweeten things up for him to speak???