Chemical reactions and catalysts. A chemical reaction involves a chemical change, which happens when two or more particles (which can be molecules, atoms or ions) interact. For example, when iron and oxygen react, they change to a new substance, iron oxide (rust).
It's important for parents to start weaning babies from bottles around the end of the first year and start getting them comfortable drinking from cups. The longer parents wait to start the transition, the more attached kids become to their bottles and the more difficult it can be to break the bottle habit.
If you, for one reason or the other, need to wean quickly, then there are a few things that are important: 1  Make sure your baby gets enough nutrition and liquid. 2  Take careful care of your breasts. 3  Consider using some safe herbs that are known to reduce breastmilk supply. 4  Keep your baby close and cuddle a lot.