At what age do babies have increased levels of digestive enzymes, making it suitable to introduce solid foods?

Four to six months

Explanation:

From four to six months old, the baby's body begins to change and has increased levels of digestive enzymes, so the child's nutritional needs change and breast milk needs to be supplemented with solid foods. Even if the baby only takes formula (artificial milk), not breast milk, it is recommended to wait until six months to give other foods, although from four months babies begin to increase their number of digestive enzymes.

nope, but i have cleaned my brush in my cup of not as potentially harmful but nevertheless, very upsetting for scottish/british folks. especially if you've used the last teabag for it

explanation:

there could be something in that . . i am indeed an old scottish man!

there's a bit of bolshie-ness with it too though. i won't let go of the old ways . . tea and whisky . . whether the young whippersnappers like it or not!