prenatal By maldeng123 Feb 1, 2002 2 Month mode swings happen 2. peeing more then often 3.swollen breasts. Mar 1, 2002 3 month Baby is 2-1/2 to 3 inches long. 2. Weight is about 1/2 to 1 ounce. 3.Arms, hands, fingers, legs, feet and toes are fully formed. Morning sickness: Fatigue Frequent urination: