Syndactyly at birth.

Me and my fiance used a sperm donor for our son. The donor was born with syndactyly as well as his father and his brothers. So it's just the boys. Our sons hands are always balled up for ultrasounds so we cant even try to tell, but was told the likelyhood of knowing for sure in ultrasound is pretty slim to none anyways. Obviously, him having syndactyly isn't and issue for us, but the closer it gets to him being here the more anxiety i have about how severe it will be and what its going to take to fix it. The donors was pretty severe. Anyone have experience in this? What should i be prepared for when he does come?