I don’t know about stuttering, but I see many children who begin to blink and squeeze their eyes with no underlying reason that we can detect. Also other “tics”. In my experience they always resolve spontaneously, usually after 3-12 months.
In my opinion it is very important to not make the behavior a matter of discussion. You should act as if you do not notice. Be patient and don’t display any impatience whatsoever as your child struggles to say something.
If it continues past 6 mo or so then you might consider seeking some help.