The mother, even with a baby this old, should avoid estrogens. I don't know who got the idea that after 4 months it's okay to use estrogens with breastfeeding mothers, but I have heard of significantly decreased supply even with an 8 month old. It is unlikely the rash is due to the hormones. The amount that gets into the milk is very low. The side effects listed by the manufacturer are all the side effects ever reported. Jack Newman, MD, FRCPC