A lot happens between six and nine months. Many babies begin to crawl, can pull themselves to a standing position, sit without support, point at things they are interested in, copy sounds and gestures, recognize favorite people, and begin to pick things up between their thumb and index finger. This is also the time when most doctors recommend adding food to a baby's diet. Babies this age can even learn some sign language to better communicate! 9_Month_Milestone_Checklist_English.pdf (helpmegrowutah.org)
Six-to-Nine-month babies love to be copy-cats. Mimicking is their way of learning and connecting sounds to language. Babbling is a baby's first form of communication. One way to promote this is to make different sounds and facial expressions at your baby so they can see your lips and tongue move and then waiting for a response. Giving them a chance to repeat the sound and faces will help them learn how to move their mouths and tongues to imitate the language you are speaking.
JUST OUT OF REACH
If you are trying to encourage your baby to crawl you can place interesting or favorite toys just out of your child's reach. They will try to wiggle forward any way they can to get the toy. If they are already able to get on hands and knees you can gently push the back of their feet, so their knees slide on the ground in a crawling motion. Babies develop at their own pace so keeping things fun will help them learn when they are ready.
FINGER FOOD FUN
At six months most babies can begin to eat solid foods. Babies should start with simple, no-chewing-required foods because there will be few to no teeth. Babies will begin picking things up in a raking grasp by using their whole hand and fingers. Give babies a chance to explore their hand and finger motion by letting them eat off of a tray. You can start with easy foods such as avocados, bananas, and cooked vegetables. Make sure to introduce each food one at a time, though, to watch for any allergies. As they get a little bigger, it is important for babies to practice the pincer grasp (picking things up between their thumb and index finger) so by about 8 months you can begin giving smaller objects like cheerios for baby to pick up.
SIT AND POINT
Many babies will already be on the go at this age, but if you can get your little one to sit for a minute you can practice pointing and name recognition. By placing several different toys in front of your baby you can say your child's name and then point to an item and ask if they want it. For example, you can say "Sam, do you want the teddy bear?" and point to the teddy bear on the ground. Then respond for them and say, "Yes! Sam wants the teddy bear!" and give them the toy. You can also use their fingers to point at things to show them the motion.