Lydia

Mother holding her baby in rocking chair.

http://thechart.blogs.cnn.com/2012/10/08/does-moms-depression-affect-babys-language/?hpt=hp_bn12

Babies can distinguish between sounds in different languages that non-bilinguals hear as the same, such as sounds ('d' in English vs. Hindi) and visual speech (watching people speak different languages without sound). Researchers found that 6 months old babies can perform these discrimination tasks, but they typically stop being able to do it around 10 months old. But the babies whose mothers had depression (but weren't taking antidepressants) failed at 6 months and succeeded at 10 months, so their critical period for language sensitivity was delayed. Researchers aren't sure why, and they don't know it it's good or bad. I don't think that a pregnant women should take any kind of medicine during the pregnancy for any reasons, because whatever mother eats is passed directly onto the baby.

distinguish (v.) to recognize or understand the difference between things or people.
antidepressant (n.) a drug used for treating depression.