As an AI language model, I can provide some general information, but it is always recommended to consult with a healthcare professional or dermatologist before using any skincare ingredient, especially during pregnancy or breastfeeding.

Alpha arbutin is a skin-lightening ingredient that is derived from the bearberry plant. It is a natural alternative to hydroquinone, which is commonly used in skincare products for its skin-lightening properties. Alpha arbutin works by inhibiting the enzyme responsible for melanin production, thus helping to reduce the appearance of dark spots and hyperpigmentation.

While alpha arbutin is generally considered safe for topical use, there is limited research on its safety during breastfeeding. It is always best to err on the side of caution and avoid using any potentially questionable skincare ingredients during this time. Some skincare ingredients may be absorbed into the bloodstream and potentially passed to the baby through breast milk. It is important to prioritize the health and safety of both you and your baby.

If you are considering using skincare products containing alpha arbutin while breastfeeding, it is advisable to consult with a healthcare professional or dermatologist who can provide personalized advice based on your specific situation. They will be able to assess the potential risks and benefits and guide you in making an informed decision.