This was taken from Kellymom
Sunscreen, Self-tanning products
Because these are topically applied, very little would absorb through the skin into the bloodstream and therefore into your milk. They should not be a problem for the breastfeeding mom and baby. Do be careful about applying it on the breast – make sure baby doesn’t get any in his mouth.
The spray tanning booths (also called UV-free tanning, airbrush tanning, spray on tanning, etc.) come under the category of self-tanning products. To prevent baby ingesting the self-tanning lotion, wash the self-tanning product from your breasts before nursing.
https://kellymom.com/bf/can-i-breastfeed/lifestyle/mom-activities/#Sunscreen