[belval]

Genuinely asking, is that true? Sugar or sucrose is a combination of glucose and fructose that can be broken down by water, since glucose is the basic sugar that cell uses wouldn't that be available regardless of the baby's digestive system?

[adrianN]

Fructose is metabolized very differently from galactose. Babies also don't have a fully formed gut microbiota. Introducing carbohydrates other than lactose too early can mess that up.