The oxidation state of an atom is the fictitious charge that an atom would have if all bonds between atoms of different elements were 100% ionic. Thus, oxidation is better defined as an increase in oxidation state, and reduction as a decrease in oxidation state.
Most babies take their first steps sometime between 9 and 12 months and are walking well by the time they're 14 or 15 months old. Don't worry if your child takes a little longer, though. Some perfectly normal children don't walk until they're 16 or 17 months old.
Learning to walk is one of the most important achievements in your baby's life, as it's a big step towards independence. Over the course of your baby's first year, he will gradually gain coordination and muscle strength, and learn to sit, roll over, and crawl. Your baby will then probably move on to pulling himself up. He may be able to stand holding on to something when he's between six months and 10 months old (Sheridan 2008, NHS 2013a) . From then on it's a matter of gaining confidence and balance. Most babies take their first steps by their first birthday. By the time they're 15 months old, most toddlers are walking unaided, though often with uneven steps (Harding 2014, Sheridan 2008) . Try not to worry if your baby takes a little longer. Some children don't walk until they are 17 months or 18 months old (NHS 2013a) .