For a child of average weight at birth (seven to seven and a half pounds) what should be the weight at the different periods during the first year?
At three months it should be twelve to thirteen pounds; at six months, fifteen to sixteen pounds; at nine months, seventeen to eighteen pounds; at one year, twenty to twenty-two pounds. At five months a healthy child will usually double its weight, and at twelve months it will nearly treble its weight.
Do all healthy infants gain steadily in weight during the first year?
As a rule they do; yet it is seldom the case that one gains every week for the entire year. With most infants there are from time to time periods of a few weeks in which no gain is made. These are more often seen from the seventh to the tenth month and frequently occur when the child is cutting teeth, sometimes during very hot weather.
Is it true that every infant who gains rapidly in weight is thriving normally?
Not invariably. Some who are fed upon prepared infant foods increase rapidly in weight but not in strength, nor in their development in other respects.
Is the weight of as much value in the second year as a guide to the child's condition?
After the first year, the gain in weight is seldom continuous; there are many interruptions, some depend on season, and others often occur without apparent cause.
At what age should the fontanel close?
The average is about eighteen months. It seldom closes earlier than fourteen months, and it should not be open at two years.