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.
When to Wean. Momcat may not want to wean her kitten if she feels that he is not yet ready for solid food. Ideally, kittens should be weaned when they are 3 to 4 weeks of age. Your kitten may be ready if his eyes are opened, he is able to focus and he can stand steadily on his feet. Itâs important not to attempt weaning your kitten too early.