38 w/5 month old and want another...husband doesn’t

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My husband will be 35 this month and has a 12 year son from a previous relationship. We have been married going on 7 years now and have been through it all trying to conceive and we finally did naturally...He doesn’t want to go through all this issues that went with the pregnancy and he says he’s to old to have another. This is my only baby and I love her beyond words but I would( if I can) have one more before I’m 40.

Anyway o can convince him to get on board with me? Any ideas?