Is it normal for a 3 year old to suddenly start thumb sucking ?

[crazyelaine]

No probs with DS sucking his thumb if he wants, it's just that he never has before.

He's been a bit unsettled recently, night waking and then falling asleep at random times through the day, tells me he has bad dreams.

My niece started at around 3 ish. bit older maybe. Never had before or had dummy or comforter. She constantly has thumb lodged in her mouth now. She will be 5 in october.

My DD started quite late too, it was when she had bigger teeth coming through at the back and it started by her sort of rubbing which developed into thumb sucking.