I do find that curious that they were so into the organic and natural stuff they never considered the most natural thing on earth and that’s breastfeeding...
If you want to feed a baby a natural diet then human breast milk is the most natural, followed by goat and cow milk.
Oat milk, rice milk, buckwheat milk and semolina milk are not "milk" and they are all highly processed.
Veganism is not natural. Even for an adult you need to eat a careful balance of often highly processed foods to maintain health.
For a baby it is death.