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.
By the time he is around 8 months, he will start learning how to stand. He will try to pull himself upright by holding on to furniture. The normal age range when a child starts walking is 9 to 15 months, and most children start walking just after the age of one - between 13 to 14 months. So if your 14 month child cannot walk, but can crawl, sit, stand, there is no cause for concern.