<span>An infant weighs 7lb at birth should weight- 13 lbs by four months of age.
1.5 lb. x 4 (months) = 6 lbs. + 7 lbs (birthweight) = 13 lbs.</span>
Premenstrual syndrome affects a high percentage of woman of childbearing age with many woman feeling mood changes in the day before menstruation
The AV valves close first, then the semilunars open and close, then the AV valves open