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how is she moving around at 18 months? crawling and sitting up ? walking yet?
that is good she is walking and running and sitting fine
I can't examine her arm or her muscles.
I'm glad she is going to see a pediatric orthopedic specialist.
she could have a congential shorter bicept muscle possibly
it doesn't sound like she would need any surgery at this point
best to let her grow and develop and continue to watch the area.
let me know if you have questions.