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.
Introduce utensils. Offer your baby a spoon to hold while you feed him or her with another spoon. As your baby's dexterity improves, encourage your baby to use a spoon. Offer a cup. Feeding your baby breast milk or formula from a cup at mealtime can help pave the way for weaning from a bottle. Around age 9 months, your baby might be able to drink from a cup on his or her own. Dish individual servings. If you feed your baby directly from a jar or container, saliva on the spoon can quickly spoil leftovers. Instead, place servings in a dish. Opened jars of baby food can be safely refrigerated for two to three days.