Both my eldest boys developed stuttering, and it would come and go. With my eldest he was about 3 and 1/2 he had moved to the bigger room in daycare and I think mixing with older children he was forming the sentences in his head quicker than he could speak the words, and would then start tripping on them. My second son has just started but he is 5, he had a traumatic year late last year breaking his femur and being in a wheelchair for a couple of months, I think this might be part of his.

Anyway to answer your question yes I would seek out speech pathology. I took both my boys quite early and they were suprisingly on the mild scale (seemed really bad to me) but the speech pathologist gave me some good strategies to try and help them.

One of them was a picture of Mr Smooth and Mr Bumpy, so when my son was talking bumpy he could visualise it, and then look at Mr Smooth etc. It has worked from my eldest, my second son is now getting some help at school using a different method (maybe due to being older) I have noticed his has improved although is still there but he is now slowing himself down.