Masaki, my sister is a physical therapist and the first few years out of graduate school she worked at LA Children's Hospital where all she worked with were infants with deformities and major birth defects. When she became pregnant, she was experiencing much of the same fears and anxieties as you since all her experience with babies and infants was with the "not normal". She ultimately had 2 beautiful, 100% healthy sons.
Marika is going to come into this world 100% beautiful and healthy....besides, she's going to have the 2 best (and nicest) parents ever!