What Causes Excess Hunger,thirst And Hyper Activeness In Infants?

21 MONTH OLD GRANDSON IS ALWAYS HUNGRY [PUTTING THINGS IN HIS MOUTH- 2 INCH SCREW THAT NEEDED HOSPITALIZATION FOR REMOVAL OF SCREW] AND VERY THIRSTY - ALL THE TIME.HE DOESN T SLEEP WELL AND IS HYPERACTIVE. IT SEEMS LIKE HIS FATHER WAS ACTIVE TOO AT THAT AGE, BUT HE IS FEARLESS AND THROWS HIMSELF BACKWARDS-OFF COUCHES OR CHAIRS OR JUST WALKING AROUND. DOESN T TALK TOO MUCH YET. COULD IT BE DIABETES TYPE 1 AND COULD HE DEVELOP IT SO YOUNG. ONE YEAR AND 10 MONTHS. HE IS A LEAN BABY, MUSCLE-Y BABY, VERY STRONG, ANGRY ALL THE TIME.THEY TAKE HIM TO THE PEDIATRICIAN OFTEN, HE GETS STREP THROAT FREQUENTLY WITH HIGH FEVERS. HIS 4 YR. OLD SISTER IS A CARRIER, BUT DOESN T GET SICK THAT OFTEN... HE IS SICK EVERY WEEK ALMOST.