During the ninth month, most infants make a determined effort to crawl, and by ten month, many will be able to crawl with straight arms and legs. It is also during the period from nine to ten months that many babies begin to pull themselves into a standing position, either holding on to furniture or someone's hands or legs. Soon afterwards, between ten and eleven months, many children can get down from a standing to a sitting position. Between eleven and twelve months, many children are able to hold on to a piece of furniture, like a couch, and move along side of it. By the end of the tenth month, many children will probably be able to stand alone momentarily, progressing to standing alone quite well by eleven to twelve months of age.
Many infants are also able to remember games played the previous day.
During the period from eleven to twelve months, most babies begin to explore space by throwing things down. This game may be annoying to some parents, but it is a game thoroughly enjoyed by many infants this age. Many children are also learning to follow simple instructions, and they may anticipate a reward for the successful completion of an act or a command. By nine months of age, most babies have begun vocalizing to toys, people, and animals in sentence-like syllables. Many children this age seem to listen carefully to the conversations of other people.