How can I help calm him?

So my bf has gone from super excited to telling me today he’s slightly nervous for everything. The delivery, the baby, dadhood, all of it. I have had 2 babies prior to this, but this is his first. He’s not extremely nervous but hearing him say those words “I’m a little nervous” made my heart throb for him. I have a little experience so for the most part I know what to expect but I felt so bad for him hearing how he’s nervous. How can I help ease his nerves? What can I do or say to let him know it’s going to be ok? I tell him all the time along with everyone else that he’s going to be an amazing father, but I’m sure there are other words of encouragement I can give him. Any advice on how to clam him? How did you calm your partner if you’ve been through this before but this is their first baby? I know he’s super excited and our baby was planned but I know me being at almost 30 weeks i expected him to be slightly nervous. Help pls! I feel so bad hearing that he’s nervous while I’m all excited!