Three tight regimens to maintain blood sugar values of 5.6 SI (group A), 5.6-6.7 SI (group B), and 6.7-8.9 SI (group C), were studied in 60 pregnant diabetic patients. The perinatal salvage rate was 96.6%. Maternal hypoglycaemia occurred only in group A. The group C regimen produced more complications than occurred in the other 2 groups. Very tight control of blood sugar is not necessary for successful management of diabetes in pregnancy and blood sugar value between 5.6-6.7 SI offers the best outcome.