Biology means that women have to do 99% of the hard work when there's a baby on the way. However much effort dad puts in after the birth, and however supportive, caring and considering he might be during the pregnancy, mom is still the one who has to carry the extra weight, feel the physical strain and go through a potentially hazardous birthing process to bring a child into the world.
It probably does, therefore, feel a little unfair when a baby emerges into the world, and very clearly has its father's face. That feeling isn't helped very much when friends and relatives come to visit, and say helpful things like 'Oh, don't they look just like their daddy?' Try not to let it worry you. Even if they have got their father's eyes, nose or cheeks, physical resemblances tend to balance out over the passage of time.