Eight-month-old babies are starting to gradually move towards the child stage, and will need more nutrition and more variety. Therefore, mothers should pay more attention to the dietary needs of eight-month-old babies. 1.Weight Baby boy: 9.12 kg, baby girl: 8.49 kg. 2.Length Baby boy: 71.5 cm, baby girl: 69.99 cm. Head circumference Male infants: 45.74 cm, female infants: 44.65 cm. 4.Dental Most of the children have already started to teethe, and some of them have already got 2-4 teeth, i.e. upper and lower incisors. 5.Motor development Eight-month-old babies can not only sit alone, but also lie down from the sitting position, hold the bed rails and stand up, and can sit down from the standing position, and crawl on their hands and knees when lying down to hold themselves up; they can clap their hands and use their small hands to pick their favorite toys to play with, but often bite them; they can eat cookies alone. 6.Language development Can imitate the monosyllabic words issued by parents. Some babies can already say the two-syllable “mama” orally. 7.Psychological development He will smile when he sees someone he knows to show that he knows “you”; he will ask for a hug when he sees someone he is close to or someone who takes care of him; he may cry if you take away his favorite toy. He will be surprised and excited by new foods. After seeing himself in the mirror, he will go behind the mirror to look for it. 8.Sleep An 8-month-old baby needs about 14~16 hours of sleep a day, and can sleep only twice during the day, about 2 hours each time, and about 10 hours at night. If the diaper is wet at night, when the baby sleeps well, you can not need to change it immediately. However, if your baby has diaper rash or a red bottom, you need to change the diaper immediately. If your baby has a bowel movement, you should also change the diaper immediately.