?: 5HT (serotonin), not directly known of its safety in breastfeeding, but SSRIs, as sertraline was studied and was safe. As for L-theanine, this is rather a herbal medicine classified as a supplement, hence no studies to determine safety in breastfeeding,which may be safe, you can confer with your doctor,your daughter's pediatrician,or wean your daughter if you aren't sure and need the the treatment
Answered 2/21/2016
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