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.
Wean Slowly. 1  1. Begin weaning in a slow, calculated manner. A slow and gradual cessation is better for both the baby and mom. 2  2. Gradually reduce the nursing sessions over the course of time. If your baby has become accustomed to a nursing session after lunch everyday, eliminate all after lunch sessions for one week.