from a bad experience with one of my child...

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Note added at 3 ore (2007-06-05 17:13:59 GMT)
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Although some dislocated hips show no signs, contact a doctor if your baby has:

* Legs of different lengths.
* Uneven thigh skin folds.
* Less mobility or flexibility on one side.

http://arthritis-symptom.com/a-c/congenital-hip-dysplasia.ht...



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Note added at 4 ore (2007-06-05 18:49:51 GMT)
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"tight hip" is one of the symptoms, but "congenital hip dysplasia" is the generic name of the illness

Tight hips

Your child's physician will test how far your child's legs can be spread apart to be certain the hips are not too tight. Upper legs bent outward until they are horizontal is called "90 degrees of spread." (Less than 50% of normal newborn hips permit this much spreading.) As long as the upper legs can be bent outward to 60 degrees and are the same on each side, they are fine. The most common cause of a tight hip is a dislocation.

http://www.med.umich.edu/obgyn/smartmoms/newborn/newborncare...



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Note added at 6 ore (2007-06-05 20:41:52 GMT)
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http://www.rothmaninstitute.com/patienteducation/joint/hip/d...

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Note added at 15 ore (2007-06-06 05:05:53 GMT)
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the more correct name of the illness is "developmental hip dysplasia",
or you could use only "hip dysplasia" in this context

http://www.pediatric-orthopedics.com/Topics/DDH___Hip_Dysp/d...