My 19 month old daughter shakes her head from side to side and has been doing this for about a year. Her doctor watched it for the first 6 months and referred us to an eye specialist. She sailed through all the tests fine. She does it several times throuhout the day and it now causes her to lose her balance as she's walking. We have an appt. with a pediatric neurologist in a month. All other developmental signs are great. She is very smart and on track or ahead of other children her age. We have also had her ears checked several times and she has never had an ear infection. Any information would be greatly appreciated. Thanks!!!