The build-up to the wedding/birth is about Patrick worrying whether he will turn out like his father. He gets some advice from Olivia that calms him and then Robin goes into labor and has complications. Goes into a coma and he has to really show himself that he won't end up like his father because right after the baby is born he is faced not only with the possibility Robin may die but the baby could get sick. That is why so much time is spent on his POV comparatively to Robin's the week of the wedding. That is also why Robin has complete faith in him. To show that she believes in him that he will be there no matter what.
Sam moves in with Lucky after her PH explodes.