A long, narrow face A large forehead A large jaw Softer skin Larger ears Crossed eyes Flat feet (with no arches) Being overly flexible Low muscle tone

Sitting Walking Talking

Not making eye contact with others Social anxiety Trouble paying attention Trouble understanding what someone is saying Acting and speaking on impulse Being hyperactive Flapping or biting their hands Sensory issues (e. g. having trouble processing certain sounds, tastes, touches, etc. ) Difficulty in picking up social cues

Epilepsy Sleep disorders (insomnia, night terrors, etc. ) Self-injury behaviors Being overly aggressive Obesity

You have a family history of Fragile X syndrome You have a family history of autism or other neurodevelopmental disorders You have infertility problems You have a family history of tremors/ataxia

Autism is not caused by one single genetic mutation, whereas Fragile X syndrome is caused by a mutation in the FMR1 gene. Autistic people do not have seizures (unless they have epilepsy), whereas some people with this syndrome have seizures. Autistic people do not have a specific appearance, whereas most kids with Fragile X syndrome have low muscle tone, large foreheads, large ears, and other physical traits that indicate the condition.

Down syndrome is caused by an extra copy of chromosome 21 (all or part of it), whereas Fragile X syndrome is caused by a mutation in the FMR1 gene. [8] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source People with Down syndrome do not have seizures (unless they have epilepsy), whereas some people with this syndrome have seizures. People with Down syndrome usually have slanted eyes, flat noses, wide necks, and underdeveloped parts of their body. Kids with Fragile X syndrome have low muscle tone, large foreheads, large ears, and other physical traits that indicate the condition.

Introversion is not caused by one gene, whereas Fragile X syndrome is caused by a mutation in the FMR1 gene. Introversion is not a condition- it is just someone’s personality. Social anxiety is not caused by one gene- it can be environmental or genetic. Fragile X syndrome is caused by a mutation in the FMR1 gene. People with Fragile X syndrome are more likely to have social anxiety, whereas people with social anxiety are not more likely to have Fragile X syndrome.