There are sunscreen products that do not use a chemical barrier to the UVA/UVB, but instead use a physical barrier. The cream goes on as usual, but the main ingredient is titanium dioxide which scatters and reflects the sunlight. This may be a good alternative for mothers concerned about the chemicals in a regular sunscreen. Since sunscreens are recommended for children six months and up, I would imagine that any product that can be applied directly to an infant, can be used by his/her breastfeeding mom. Elizabeth