my bb is 3 months old that is why i dun think i want to use any flash. when i use f1.8, i focus on the eyes. the pictures turn out to be sharp on the eyes and nose but the hair area is blurr. pictures look nice but i feel it could be better with the hair and chin area sharper as well.
i am using canon 50mm f1.8
If all else fail and you have to use flash, just don't direct the flash direct at baby's eyes. Bounce it off the ceiling or wall.