Language development symptoms and conditions

My daughter just turned 3 yrs old, and was put on Singulair about a month ago. In this time I have noticed she has been stuttering. She is 3 yr old that has a huge vocabulary & is very smart (if I do say so myself). It is very odd to me that she is stuttering. In asking the DR, he did not feel it was medication related. But may I also add that she is fully potty trained & in the last few weeks has been wetting the bed every night.

Is anyone else's child stuttering?