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.
With this type of weaning, you watch your babyâs cues and wean at her pace. Babies who are weaned naturally usually stop breastfeeding completely sometime between 2 and 4 years of age. Planned weaning or âmother-led weaningâ happens when mothers decide to start the weaning process. A partial wean means substituting one or more feedings with a cup or bottle and breastfeeding at other times. This can work well if you are going back to work or school, but still want to breastfeed.