What is the ruling on purchasing towels and feminine hygiene products, and on inserting suppositories for the mother?

There is no harm in buying your wife's personal necessities, such as sanitary pads, and you are obliged to do so out of kindness to her if she asks you to. As for inserting suppositories for her, it is not permissible except in cases of necessity, such as if she is unable to do it herself, and cannot find another woman to do it, and she needs them for treatment. In such a case, it is necessary to limit touching or looking only to the extent of the need.