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.
Generally, a baby will be ready to be weaned from the bottle sometime between the ages of 9 months and 18 months. There are basically two things that must happen for your baby or toddler to be weaned from the bottle. The first is that your babyâs sucking need has to slow down or stop.