It's very common for any future Daddy to feel neglected and comparatively unimportant because he's not the one carrying the baby. If you suspect that your partner longs to be more involved, enlist his help as your right-hand man.
Ask him to be present during your regular checkups, while you shop for baby furniture and to help out when you set up the gift registry. He can also take off some of the pressure by giving you regular foot rubs, cooking dinner and taking over house cleaning. Be sure to heap praise upon your helper, rather than taking his efforts for granted. Many a woman has slogged through pregnancy with nary a finger lifted by her partner, so tell your guy how much you appreciate him. If you're lucky, maybe he'll keep it up after the baby is born!