At 9 months, your baby is comfortable moving from crawling to sitting and back again to fetch toys. If you cover at least a large portion of his favorite toy in front of him, he is able to find the hidden toy. He is now able to pay attention to smaller environmental sounds outside, such as the sound of rain, wind, and leaves rattling. At 9 months of age, the fontanelle is not yet closed, but usually closes at 12-18 months of age. At this time the baby grows 2 to 4 teeth. This month the baby is expected to gain 0.28-0.43 kg in weight, can grow 1.21-1.33 cm in height and 0.3 cm in head circumference. Vision Vision can move up and down with moving objects, follow falling objects, look for dropped toys, and distinguish the size and shape of objects and the speed of movement. Can see small objects, can begin to distinguish simple geometric shapes, and observe different shapes of objects. The sense of depth of vision begins to appear, which is actually a kind of three-dimensional perception. Hearing Your baby can understand simple questions from adults This month you will be surprised to find that your baby can understand simple questions from adults. For example, if you ask, “Where’s Daddy?” “Where is mommy?” Your baby will make a connection between the sound and the content of the sound and turn his or her head to look for dad or mom. If you stop your baby from doing an activity, for example, by saying “no” to your baby, your baby’s hands will stop, or he or she will look at you unhappily and cry. Language Your baby can call “daddy” and “mommy” Your baby’s language skills have improved greatly, and one of the most gratifying things for mommy and daddy is that your baby can call “daddy” and “mommy”. “This is another big progress in the baby’s life. Babies are no longer satisfied with just repeating syllables, but will also play with sound pitch changes and make many sounds similar to adult speech. Some babies can even answer your questions with simple language and clearer vocalizations. Movement Your baby can stand up holding on to the railing and sit on his buttocks. Your baby can sit like a bell at this time, sitting firmly and turning around while sitting. The baby’s progress can not only be these, he can stand up with his hands on the railing, the bold baby can even walk two steps sideways. After standing up, he can sit down, although he often falls on his butt with a thud, but this is also a very big progress. After 9 months, your baby will be able to pinch small objects with his thumb and forefinger; he will knock the toys in his hands; he will know how to get the toys that are out of his reach, so if you love to play, you may want to tease your baby more.