This is a brilliant question. You have done much research on this subject already. Your little granddaughter is definitely behind with her milestones especially her walking and speech. This could well be due to her mother using drugs like cocaine and possibly other drugs as well which can cause delayed development in the children of the drug user as one of the most important side effects. I doubt there could be another reason unless there were any problems during the birth of your granddaughter. She really needs to be assessed by a paediatrician with experience in developmental assessment. It may be best to take her to see a paediatric neurologist as soon as possible.
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