Personally I think that's a good decision. I just wanted to add that if you intend to go private you may well find an international school that will take him already at age 3. My son attended the bilingual Swiss International School here in Basel when he was 3 1/2 - and he was allowed to start mid-year in January. Private schools are generally more flexible about such things (because frankly they want your money!) We switched over to public when he was old enough for kindergarten - because of his birthday he wasn't eligible to start Kindergarten until age 5.