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.
1 Breastfeeding as long as you can is the best thing for your baby. 2  As you introduce your baby to new foods, you can continue to breastfeed. 3  Itâs easiest for you and your baby if weaning is gradual.  The right complementary food will depend on your babyâs age when you start to wean.