Did you tell your doctor you were breastfeeding? That's important information to share with your treating physician. But many people are not getting their Botox performed by a physician which may result in not getting proper information or pre-procedure evaluation/counseling which probably would have involved a discussion about whether it would be advisable to have the Botox done at all prior to breastfeeding. Most physicians would not advise doing Botox during pregnancy or breastfeeding.
Web reference: http://www.eastbaylaser.com/