Fianc� doesn't want anymore children!?

I have a 19 month old daughter from a previous relationship..her father is not in the picture at all...he's never even seen her in person! My fianc� is 30 and I'm 23... I'm currently 35.3 wks pregnant with another girl.... I really want another baby in the future (try for a boy)... He says he doesn't want anymore kids after this one... I'm kind of hurt by this as I plan to spend the rest of my life with him... I realize he's older but he acts like he's going to be too old to have another in say 5 years or less! I've tried talking to him but nothing convinces him... What should I do? I love him dearly but I'm hurt by this as I really would like to try for a boy later on....advice please!?