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the first month of a newborn's life is a time of rapid change and adaptation, and parents are often surprised and confused by their baby's physical changes. this article will introduce in detail the growth and development characteristics of newborns in the first month after birth, as well as related nursing suggestions.

weight changes are one of the most obvious characteristics of a newborn. during the first few days of life, babies lose approximately 10% of their birth weight, primarily due to the loss of excess fluid from the body. however, most babies return to their birth weight by about 10 days. after that, the baby will grow very quickly, especially during the growth spurt, which usually occurs between 7-10 days and 3-6 weeks after birth. on average, newborns gain 20-30 grams per day and weigh about 4.5 kilograms after one month. it's worth noting that baby boys usually weigh slightly more than baby girls, with the difference being about 350 grams.

height growth is also significant. during the first month, the baby's height will increase by 4.5 to 5 centimeters. likewise, baby boys tend to be slightly longer than baby girls, with the difference being about 1.25 centimeters. growth in head circumference is particularly important because it reflects brain development. the average head circumference of a newborn is about 35 cm, which will increase to 38 cm after one month. the head circumference of baby boys is usually slightly larger than that of baby girls, but the difference is less than 1 centimeter.

body posture also changes. during the first few weeks, the baby will gradually unwind from the constricted position in the womb and begin to stretch its limbs. some babies may develop bow-legged condition, which usually corrects itself around one year of age. only in rare cases will your doctor recommend orthodontic appliances.