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At twelve months, a baby is one year old; from this age we begin to use the word child. The child is now an individual with a personality of their own.
There are some simple measurements for assessing growth and development. At around one year, a healthy baby born at term reaches three times their birth weight and 1.5 times their birth length. For example, a birth length of 50 centimeters becomes approximately 75 centimeters at one year. Head circumference grows faster in the first months after birth and more slowly afterward, reaching an average of 47 centimeters at one year. The average measurements at one year are 10 kilograms in weight, 75 centimeters in length and 47 centimeters in head circumference. These can vary with the parents' physical characteristics. Genetic factors are important, so we also consider the family's physical build when assessing babies.
A one-year-old child gradually begins to speak and may say short words such as baba, mam, dede and meme. Some begin speaking earlier and others later; parental characteristics and genetic factors have an influence.
Tooth development also depends greatly on family factors. The first baby tooth may begin to emerge in the fifth month; in completely healthy babies, its emergence may be delayed until the fifteenth month. A twelve-month-old may have seven or eight teeth, while some babies have none on their first birthday. This is also entirely normal and is related to genetic factors.