Fruits are how we obtain our digestive enzymes, that's why it better to eat raw. Not sure if papaya has all that you need, but this is the list of enzymes in the supplement I take. I don't know of a source for your son, but I have had several kids that I know personally that have benefitted from getting off of OTC baby washes and lotions. I would love to send you a few articles that I have collected if you send me an email address.
I don't have eczema, but I do have a slow bowel due to thyroid quitting (radiation with cancer). I am also anemic which contributes. I benefit from the enzymes, a high quality vitamin and mineral source (Arbonne) and pro-biotics (whole foods, Udo's Choice brand).
You may want to avoid splenda, too. It lowers intestinal bacteria by 50%. My daughter, 3, used to get kidney infections and yeast infections until we took it all out of her diet and put her on probiotics.
Arbonne’s Essential Enzyme Blend™
Arbonne’s Digestive Herbal Complex (ingredient and source)
Ginger Ginger Root
Peppermint Peppermint Leaf
Chamomile Chamomile Flower
Fennel Fennel Seed
Hawthorn Hawthorn Fruit
Email me if you are interested,