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.
Start weaning the kitten off of her motherâs milk at around 4 weeks of age. Kittens need to be weaned off motherâs milk and onto solid foods before adoption both for their health and to avoid bad habits like âwool sucking,â where catâs chew and suck on things like fabric. The mother cat will wean her kittens on her own, usually by 8-10 weeks.