ברית מילה לפג עם היפוספדיאס

Shalom! My wife has recently given birth to twins – two baby boys. They were born prematurely (week 32).The first son (1300 grams) was born with mild hypospadias. The second son (1700 grams) was born with no special conditions.What is the halacha regarding the brit-Mila of my sons? Is there a way to 'minimize the trauma' of my first son, especially since he has already undergone surgery (Esophageal Atresia)?Brachot,