The average weight of a male child at different ages is as follows:

Birth7-1/2 lbs.
3 weeks8 lbs.
1 month8-1/2 lbs.
3 months12 lbs.
4 months13-1/2 lbs.
5 months15 lbs.
6 months15-1/2 lbs.
7 months17 lbs.
9 months19 lbs.
1 year21 lbs.
1-1/2 years23 lbs.
2 years26-1/2 lbs.
3 years31-1/2 lbs.
4 years35-1/2 lbs.
5 years40 lbs.
6 years45 lbs.
7 years49 lbs.
8 years54 lbs.
9 years59 lbs.
10 years65-1/2 lbs.

A female child weighs about one-fifteenth less than a male child, as a rule.

Table showing the average height of a male child, at different ages:

At birth20-1/2 in.
6 months26 in.
1 year29 in.
2 years32-1/2 in.
3 years35 in.
4 years38 in.
5 years41-1/2 in.
6 years44 in.
7 years46 in.
8 years48 in.
9 years50 in.
10 years52 in.

The Rate of Growth of a Child.—A child grows most rapidly during its first year—six to seven inches; from fourth to sixteenth, about two inches annually; thence to twentieth, one inch. Commonly, a child at two and a half years has attained half of its ultimate adult stature. The diseases of youth always accelerate growth.

Pulse Rate in Children and Adults.—Normal Pulse,—of new born, 130 to 140, per minute; first year, 105 to 115; second year, 106 to 115; third year, 95 to 105; fifth to twelfth year, 80 to 90; thirteenth to twenty-first year, 75 to 80; twenty-first to sixtieth year, 70 to 75; in old age, 75 to 85.

Infant Records.—A record should be kept by the mother of every child which would embrace exact data as to weight, diet, size, development of mental power, teeth, ailments, sickness, pains, etc., with dates and any information which would aid in recalling exact conditions. Such records are of the utmost value in a number of ways. They help in giving suggestions as to diet, general health, and mental qualities of the child in question, and they aid in furnishing what physicians call "past history," which past history has a very valuable significance in estimating the character and importance of sickness during later years.

Such a record is also of importance in comparing a child's development with what is regarded as standard development, and also with the growth and development of other children in or out of the family.

If a child should thus be found to fall seriously below the standard and yet not appear actually sick, a very thorough and routine investigation should be instituted to discover if possible the cause. Some error might thus be detected which might seriously affect the child's future growth and well-being.