In the last week DD (16months) has started shaking head vigorously side to side when eating dinner. She only does it for a few seconds at a time but her eyes go funny when she's doing it and sort of collapses for a few seconds in her high chair afterwards - before doing it again. She seems to enjoying it but t is worrying me. We have tried to not say anything as she is at teh age that if we say "no" or try to stop her she just does something mroe and more.
Should I take her to the GP? Is this just normal behaviour?