Hi My Son Is 4 And Half Years Old..he Weighs

Hi my son is 4 and half years old..he weighs 23 kgs..he is very active..but he wakes up once at night almost every night saying he is thirsty..i had gestational diabetes and currently am a diabetic at 36 years..so im a little concerned..should i get him checkef..or is it too early..i have a glucometer at home..once couple of months ago i checked his fasting it was 90..wat is d normal rating for kids?