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.
Most younger infants are able to stand up with support and bear weight on their legs between 2 and 4 1/2 months, and no, it won't cause them to have bow-legs. Most toddlers can walk backwards between 13 and 17 months. Most toddlers begin running and walking up steps at 14 months.