What is the standard weight gain for newborns?

Patient's question:

My baby's anterior fontanel was approximately 1.5cm x 1.5cm to 2cm x 2cm when he/she was born, and it slightly increased over time. What is the standard weight gain for newborns?

Doctor's answer:

Within one week after birth, weight loss may occur temporarily, also known as physiological weight loss. It reaches its lowest point around 3-4 days after birth and then gradually increases. By 7-10 days after birth, it should return to the original birth weight. If the weight loss exceeds 10%, or if the weight does not recover within 10 days after birth, it is considered a pathological condition, and the cause should be analyzed, such as inadequate feeding after birth or the influence of intrauterine factors, or the child may have underlying health issues. In short, a newborn should gain 1-1.5 kilograms in the first month after birth.

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