During the 1st week of life, newborns lose up to 10% of their birth weight, and this is because when babies are born, their bodies have retained fluids from inside the womb. With the shedding of those fluids, their birth weight drops. Afterwards, the infant adds weight at a rate of 30 grams per day. So by the age of one month, an infant whose birth weight was 3.8 kg is expected to weigh around 4 kg.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.