From my aged viewpoint having botox and fillers whilst breastfeeding feels odd. It would never have occurred to me but I’m trying not to sound old fashioned!

There is no published research that I have been able to find and trust on the passage of fillers into milk so I cant say that they are safe or unsafe. I just do not know.

There is some information from one mother who caught botulism from eating fermented salmon eggs. She continued to breastfeed. No botulinum toxin or botulism was found in the breastmilk or the baby. The doses that are used medically are far lower than that which would have caused the mother’s botulism so the amount in breastmilk is assumed to be too low to produce adverse effects.

Both these cosmetic procedures have to be undertaken with this limited information in mind. It is your choice and I am not making any recommendations.

References
1. Lee KC, Korgavkar K, Dufresne RGJ et al. Safety of cosmetic dermatologic procedures during pregnancy. Dermatol Surg. 2013;39:1573-86.
2. Middaugh J. Botulism and breast milk. N Engl J Med. 1978;298:343.