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.
The weaning process begins the first time your baby takes food from a source other than your breast â whether itâs formula from a bottle or mashed banana from a spoon. Weaning is the gradual replacement of breastfeeding with other foods and ways of nurturing.