Dear sir,                When my wife went for usg in 36th week of pregnancy...1st time seen 8 mm right and 7.9 mm left pelvis dilation of my baby.. Next day she operated nd got baby boy...there after in routine usg.. Here are apd values of left renal pelvis- 1. Age 6 days - 8.9 mm 2. Age 1.5 month- 3.9 mm 3. Age 4 month- 4.4 mm 4. Age 9 month- 4.15 mm 5. Age 16 month-4.24 mm 6. Age 2 yr 5 month-5.37 mm Right now My baby is 2.9 month of weight of 12 kg is asymptomatic..my concern is given belows- 1. Is it not hydronephrosis ??  2. In last scan there is increasing apd more than 1 mm.. is it error or hydronephrosis is starting worst? 3. What I do now.. Should I stop doing usg or do at time interval of 2 years??