Both usually have the same base cause, but effect different muscle or areas of the brain...
Stargazing effects the area of the brain that controls the upper neck muscles
Ataxia can effect the lower muscles, causing the head to draw down instead of up.
These symptoms can also be signs of other minor problems that can be corrected.
Some things to try:
Up the calcium for a few weeks and make sure the dragon is under a good working UVB light, if you can not meter it and have doubts, change it with a new one.... if your not using one, thats probably your problem.
Vitamin B's, add some more in to the diet, either in food or supplements (you can use human grade Vitamin B but just a small pinch every other day and try that for a few weeks.
Dragons that have recovered from this usually had lack of one of the two above and it may not be just in the diet, the baby may not be absorbing them properly.
IF neither of those things improve the situation, they only testing can tell you if it is viral (thats the most common cause in babies) bacterial or neurological base. And sadly in each of those, there is not a good survival rate.
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