Is saponin to harmful? Is it harmful to babies?

I make Quinoa milk for my son…….. I just ran out of his milk so Im making Quinoa milk until I get some more in the morning. My son is 5months. I have made this kind of milk before….you have to rinse it really good to get the bitter taste from the saponin of the grain. When you boil it and if the water looks soapy that means there was a little saponin still left behind. I don’t have anymore Quinoa if not I would have made better batch….. there wasnt much but I still wanted to ask.