need real research not just advertisments for product but out of ideas for key words. would like to know the effects on the brain and if taught before speech how it will effect comprehension, writing skills, reading and speech pattern. any ideas where i should look?????????
Has anyone found anything online and can point me in the right direction? Please help running out of options.

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a disadvantage is that it might delay language development for babies.
an advantage is that the baby is now multi lingual