How can I choose right ingredients for baby products?

When I create a formula for baby, I need to choose the raw materials first. But how can I know if this ingredients is suitable or not? 
Example, I did a baby shampoo but the feeling is not good, it's dry. So, I decided to add a mild silicone to the formula. But it's not mentioned in the supplier's documents. Where I can read about this? where can I read about the irritation rate of an ingredient, the percentage I should use in formula? What the websites do you like most?
Thank you in advance.

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