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 do decide to wean earlier you will need to remember the following: 1  all feeding equipment, including bowls and spoons will need to be sterilised. 2  younger babies need pureed foods and certain foods need to be avoided. 3  all food will need to be pureed to a completely smooth, thin consistency until your baby is 6 months old.