In order to know whether a baby is normal and developing properly,there must be certain standards for judgment,but individual babies will very somewhat from the average. To state that an average infant's birth weight should be seven pounds sets a value that is strictly true for only a few. Many who are perfectly normal weight six, eight, or nine pounds. Extreme variations are significant. More improtant than size and growth at any particular period is a constant and steady progress evaluated by various established criteria